What Are VOCs in Baby Mattresses? The Complete Guide to Off-Gassing, Indoor Air Quality & Safer Sleep
The Complete Guide to Off-Gassing, Indoor Air Quality & Safer Sleep.Your baby may spend up to 16 hours a day sleeping during the early months of life.During that time, they are breathing just centimetres away from their mattress.
Most parents spend weeks choosing the right cot, comparing nursery furniture, bedding, prams, monitors and sleepwear. Far fewer stop to ask one of the most important questions:
What is my baby’s mattress actually made from?
It is a question more parents are beginning to ask as awareness grows around indoor air quality, off-gassing, synthetic foams, flame retardants and the materials used inside everyday household products.
A cot mattress is not just another nursery item. It is one of the largest surfaces your baby sleeps on, rests on and spends time close to during the earliest stages of life. That does not mean parents need to feel frightened or overwhelmed. It simply means the materials inside a baby mattress are worth understanding.
Some mattresses are made with polyurethane foam, memory foam, synthetic fibres, chemical adhesives or added treatments. Others use natural materials such as coconut coir, natural latex, wool and organic cotton. Some are independently tested for low emissions. Others rely more heavily on marketing terms such as “eco”, “green”, “plant-based” or “natural feel”.
In this article, we explain what VOCs are, what off-gassing means, why some new mattresses smell, how polyurethane foam differs from natural latex, which certifications matter, how to read a mattress legal label, and what to look for when choosing a lower-VOC cot mattress in Australia.
At Milari Organics, we believe parents deserve clear, honest information—not fear-based marketing and not vague claims. Every material inside a baby mattress should have a purpose. If a brand chooses a material, it should be able to explain exactly why it is there.
In This Guide
* What are VOCs?
* What is off-gassing?
* Why does indoor air quality matter in a nursery?
* Why do some new mattresses smell?
* What is polyurethane foam?
* Is memory foam different?
* Natural latex vs foam: what is the difference?
* Is the smell of natural latex harmful?
* Why the mattress legal label matters
* Which certifications should parents understand?
* Why mattress materials should work together
* The story behind Milari’s removable Pebble™ cover
* How to choose a lower-VOC cot mattress
* Frequently asked questions
Quick Summary
If you only take one thing from this guide, let it be this:A baby mattress should be judged by more than how it looks or feels. Parents should also consider what it is made from, whether the materials are clearly disclosed, whether certifications apply to the actual components, and whether the mattress has been designed for firmness, breathability, practicality and transparency.
VOCs and off-gassing can sound intimidating, but the goal is not to panic. The goal is to ask better questions.
* What materials are inside the mattress?
* Does it contain polyurethane foam or memory foam?
* Are adhesives or chemical treatments used?
* Is the mattress independently tested for low emissions?
* Does the legal label match the marketing?
* Can the brand explain every layer clearly?
The more transparent the answer, the easier it becomes to make an informed decision.
What Are VOCs?
If you’ve been researching baby mattresses, you’ve probably come across the term VOCs. It appears in articles about indoor air quality, nursery design, paints, furniture, flooring and mattresses—but what does it actually mean?
VOC stands for Volatile Organic Compound.
These are carbon-based compounds that readily evaporate into the air at room temperature. As they evaporate, they become part of the indoor air we breathe.
The important thing to understand is that not all VOCs are the same.
Some VOCs occur naturally. For example, the fresh scent of pine trees, eucalyptus or citrus peel comes from naturally occurring VOCs released by plants.
Other VOCs can be associated with manufactured products such as paints, varnishes, cleaning products, adhesives, synthetic foams and some furnishings. The type and amount of VOCs released varies significantly depending on the material and how it was manufactured.
This is why simply hearing the word “VOC” doesn’t tell the whole story.
For parents, the more useful question is:
What materials are used inside my baby’s mattress, and have they been independently tested where appropriate?
Understanding the answer helps you look beyond marketing language and make a more informed decision.
💡 Did You Know?
Many household products can contribute to indoor VOC levels, including freshly painted walls, new flooring, cabinetry, furniture, cleaning products and some mattresses. A baby’s sleep environment is just one part of the overall indoor environment.
What Is Off-Gassing?
The term off-gassing refers to the process of volatile compounds being released from a material into the surrounding air.
You’ve probably experienced it before without realising it.
Opening a new car.
Installing new carpet.
Buying a new sofa.
Unboxing a new mattress.
That distinctive “new” smell often comes from compounds that are gradually being released into the air after manufacturing.
Some products release most of these compounds during the first few days or weeks, while others may continue releasing very low levels over a longer period. This varies depending on the materials used, the manufacturing process and the surrounding environment.
It’s also important to remember that smell alone is not a reliable indicator of safety.
Some materials have a strong natural scent but very low emissions, while others may have very little odour despite releasing measurable volatile compounds.
For this reason, many parents choose to look for products that have undergone independent emissions testing rather than relying on smell alone.
🌿 Parent Tip
If you’re setting up a nursery, it’s a good idea to allow newly purchased furniture and mattresses to air in a well-ventilated room before use, following the manufacturer’s care instructions. Good ventilation is one simple way to support healthy indoor air quality.
Why Does Indoor Air Quality Matters?
Most babies spend many hours sleeping during their first year of life, making the nursery one of the spaces they occupy most frequently.
At the same time, modern homes are often built to be more energy efficient than ever before. While this improves heating and cooling efficiency, it can also reduce natural air exchange if windows and doors remain closed for extended periods.That is one reason indoor air quality has become an increasing focus for many families.
Rather than concentrating on a single product, many parents now take a broader approach by considering the overall nursery environment. This may include choosing low-emission paints where appropriate, ventilating newly renovated rooms, reducing unnecessary fragrances, selecting thoughtfully made furnishings and understanding the materials used inside products such as mattresses.
The aim is not to create a “perfect” nursery—there is no such thing.Instead, it is about making informed choices wherever practical.
For many families, the cot mattress becomes an important part of that conversation because it is one of the few products their baby spends extended periods resting on each day.
As awareness grows around indoor air quality, many parents are choosing products that clearly disclose their materials, explain their certifications and are transparent about how they are made.
At Milari Organics, we believe transparency is one of the most important ingredients of a safer sleep environment. Parents shouldn’t have to guess what’s inside a mattress—they should be able to understand every layer and why it’s there.
Quick Summary
✓ VOCs are a broad group of compounds, and not all VOCs are the same.
✓ Off-gassing refers to compounds being released from materials into the surrounding air.
✓ Many everyday household products—not just mattresses—can contribute to indoor air quality.
✓ Independent testing and clear material disclosure are often more meaningful than marketing claims alone.
What’s Really Inside Many Baby Mattresses?
Walk through the baby aisle of almost any retailer and you’ll see words like natural, eco, plant-based, green, non-toxic and premium.
These terms can certainly sound reassuring—but they don’t always tell you what a mattress is actually made from.
One mattress may rely primarily on polyurethane foam. Another may combine natural fibres with synthetic materials. Another may use renewable materials throughout its core while incorporating carefully selected materials elsewhere for practical performance.
This is why understanding what is inside a mattress—and why each material has been chosen—is often more valuable than relying on marketing language alone.At Milari Organics, we believe every material should earn its place. More importantly, every manufacturer should be willing to explain exactly why each material is there.
Understanding Common Mattress Materials
There is no single “correct” way to build a baby mattress. Different manufacturers use different combinations of materials depending on the performance they are trying to achieve.
Some of the most common materials found in baby mattresses include:
* Polyurethane foam
* Memory foam
* Polyester fibres
* Natural latex
* Coconut coir
* Wool
* Cotton
* Various adhesives and bonding materials
Each material has its own characteristics, advantages and considerations.
The key is understanding the role each one plays within the overall mattress.
What Is Polyurethane Foam?
Polyurethane foam is one of the most commonly used cushioning materials in conventional mattresses.
It is lightweight, versatile and relatively inexpensive to manufacture, making it a popular choice across furniture, bedding and baby products.
Polyurethane foam is primarily derived from petrochemical ingredients, although some manufacturers incorporate small amounts of plant-derived ingredients into certain formulations.
Not all polyurethane foams are identical. Manufacturing methods, formulations and emissions can vary between products, which is why many parents look beyond generalisations and instead ask about independent testing and material transparency.
Is Memory Foam Different?
Memory foam is a type of polyurethane foam that has been modified to respond more slowly to pressure and body heat.
This creates the familiar “slow sinking” sensation many adults enjoy in their mattresses.
However, babies have different sleep requirements.
What About “Plant-Based” or “Green” Foams?
You may also come across terms such as:
* Soy foam
* Plant-based foam
* Green foam
* Eco foam
These descriptions can sometimes create the impression that a mattress is entirely natural.
In reality, many of these products remain polyurethane foams, with a portion of the formulation replaced by plant-derived ingredients.
That doesn’t necessarily make them good or bad—but it does illustrate why it is helpful to look beyond marketing terms and ask more detailed questions about the materials used.Transparency matters far more than clever wording.
💡 Parent Tip
When comparing mattresses, don’t be afraid to ask the manufacturer:
* What is the mattress core made from?
* Does it contain polyurethane foam or memory foam?
* Are the materials independently certified?
* Why was each material chosen?
A transparent manufacturer should be able to answer these questions clearly.
Every Material Should Earn Its Place
At Milari Organics, we don’t believe a mattress should be judged simply by whether it contains natural or synthetic materials.
We believe it should be judged by how thoughtfully it has been designed.
Every material should perform a specific function.
Every design decision should have a clear purpose.
And every manufacturer should be transparent about why those materials have been chosen.
This philosophy guided every decision we made when designing our mattresses.
Rather than relying on a single material to perform every function, we developed a carefully balanced sleep system where each layer contributes to firmness, breathability, comfort, durability or practicality.
Material Spotlight: Organic Coconut Coir
Organic coconut coir forms the supportive core of every Milari mattress.
Made from natural coconut fibre, it provides structural firmness while allowing air to move naturally through the mattress.
Its open fibre structure contributes to excellent airflow and helps create a firm sleep surface suitable for infant sleep.
Material Spotlight: GOLS-Certified Natural Dunlop Latex
Natural Dunlop latex is harvested from the sap of rubber trees rather than manufactured from polyurethane.It is naturally resilient, supportive and durable, helping the mattress maintain its shape over time.
Our natural Dunlop latex is GOLS-certified and sourced from a supplier whose latex is also certified by eco-INSTITUT®, providing independent assurance relating to both the organic latex standard and low-emission performance.Unlike memory foam, natural latex responds immediately to movement rather than creating a slow-sinking feel.
Many parents also notice that natural latex has its own distinctive earthy aroma when new. This is a natural characteristic of the material and is different from the chemical odour sometimes associated with synthetic foams and adhesives. We’ll explore this in more detail in the next section.
Material Spotlight: Australian Wool
Australian wool plays an important role within the Milari sleep system.It naturally assists with temperature regulation and moisture management while also serving as our natural fire barrier, allowing us to avoid the use of added chemical flame-retardant treatments within the mattress.
Material Spotlight: GOTS-Certified Organic Cotton
The mattress itself is enclosed within a GOTS-certified organic cotton inner cover.This breathable mattress surrounds the natural mattress layers and forms part of the organic sleep system beneath the removable outer cover.
Thoughtful Design Beyond the Mattress Core
Designing a baby mattress isn’t simply about choosing the most natural materials possible.
It’s about creating a product that performs beautifully in real family life.
That’s why every Milari mattress includes our signature removable Pebble™ outer cover.
Parents can choose to use this breathable, machine-washable cover for everyday protection or remove it entirely, revealing the mattress enclosed within its GOTS-certified organic cotton inner cover.
To ensure the removable cover maintains its shape and dimensional stability through repeated washing, we incorporate a small amount of recycled polyester within the internal pebble structure only.
Importantly, this recycled polyester is fully enclosed within the pebbles and does not come into direct contact with your baby’s skin.
We deliberately chose this engineering solution instead of using a waterproof plastic barrier, which can reduce breathability.
The result is a practical, removable, machine-washable cover that helps protect the mattress from everyday spills while allowing parents the flexibility to use or remove it as they choose.
We believe thoughtful design means being transparent about every material we use—and explaining exactly why it’s there.
✓ Key Takeaways
* Marketing language doesn’t always explain what is actually inside a mattress.
* Different materials perform different functions, and every material should have a clear purpose.
* Transparency is often more valuable than broad marketing claims.
* Understanding the materials, certifications and construction of a mattress helps parents make informed decisions.
* At Milari Organics, every design decision is made with the same philosophy: Every material should earn its place—and every parent deserves to know why.
Why the Mattress Legal Label Matters?
When researching a baby mattress, it’s easy to be drawn to beautiful photography, reassuring marketing language and long lists of features.
But one of the most valuable pieces of information is often the one parents overlook.The legal label.
Every mattress sold in Australia is required to include a legal label identifying the materials used in its construction. While the exact format and wording may vary, the label provides a standardised description of the materials inside the mattress.
Unlike marketing language—which is designed to highlight a product’s benefits—the legal label is intended to identify the materials used.That makes it one of the simplest places to begin understanding what’s actually inside.
Today’s mattress market is full of phrases like:
* Organic
* Natural
* Eco
* Green
* Plant-based
* Chemical-free
* Premium
* Sustainable
These terms may reflect aspects of a product, but they don’t always explain the complete construction of the mattress.The legal label provides another layer of transparency by identifying the materials used in the finished product.
🌿 Parent Tip
When comparing baby mattresses, don’t just ask:
“Is it natural?”
Also ask:
* What materials are actually used?
* Why was each material chosen?
* Are those materials independently certified?
* Can the manufacturer explain every layer of the mattress?
The more transparent the answers, the easier it becomes to compare products with confidence.The Legal Label Is the Beginning of the Conversation.A legal label tells you what materials have been used.
For example:
* Why was natural latex chosen instead of polyurethane foam?
* Why is wool used?
* Why is coconut coir used?
* Why was a particular fabric selected for the sleep surface?
* Has the mattress been independently tested?
* What certifications apply to each material?
These are the questions that help parents move beyond marketing claims and understand the design philosophy behind a mattress.
Transparency Matters More Than Perfection
No two baby mattresses are constructed in exactly the same way.Different manufacturers make different decisions depending on the performance they want to achieve.
At Milari Organics, we believe every material should earn its place—and every parent deserves to know why it has been chosen.That’s why we’re transparent about every layer of our sleep system.
Our mattress core is built using thoughtfully selected natural and organic materials, including organic coconut coir, GOLS-certified natural Dunlop latex, Australian wool and a GOTS-certified organic cotton inner cover.
We also include a removable Pebble™ outer cover designed to make everyday family life easier. To ensure the cover maintains its shape through repeated machine washing, a small amount of recycled polyester is incorporated within the internal pebble structure only.
Importantly, this recycled polyester is fully enclosed within the pebble construction and does not come into direct contact with your baby’s skin. If parents choose to remove the Pebble™ cover, the mattress remains enclosed within its GOTS-certified organic cotton inner cover.
✓ Key Takeaways
* The legal label is one of the best places to begin understanding what’s inside a baby mattress.
* Marketing language and legal material descriptions serve different purposes.
* A transparent manufacturer should explain not only what materials are used, but why they were chosen.
* Independent certifications help verify specific aspects of materials, while the legal label helps identify what those materials are.
* The more transparent a brand is about its construction and design decisions, the easier it becomes for parents to make an informed choice.
Understanding Mattress Certifications
If you’ve spent time researching baby mattresses, you’ve probably come across a long list of certifications.
GOLS.
GOTS.
OEKO-TEX® STANDARD 100.
eco-INSTITUT®.
At first glance, they can all seem to mean the same thing.
Why Certifications Matter?
Independent certifications help provide confidence that specific materials have been assessed against recognised standards rather than relying solely on a manufacturer’s own claims.
Different certifications focus on different areas, including:
* Organic raw materials
* Textile processing
* Chemical substances
* Low emissions
* Manufacturing practices
* Traceability
The key is making sure the certification actually relates to the material being discussed.
💡 Parent Tip
Rather than asking:
“Is this mattress certified?”
Ask:
“Which materials are certified, and what does each certification actually assess?”
It’s a much more meaningful question.
GOLS
Global Organic Latex Standard
GOLS applies specifically to organic natural latex.
It helps verify that the latex meets requirements relating to organic raw material content, processing and traceability throughout production.If a mattress advertises organic latex, GOLS is one of the most recognised certifications to look for.It’s important to remember that GOLS applies to the latex itself—not necessarily every other component of the mattress.
GOTS
Global Organic Textile Standard
GOTS applies to organic textiles, such as organic cotton.
It assesses the processing of organic fibres while also considering environmental and social criteria throughout manufacturing.For parents, GOTS provides confidence that the organic textile components have been produced to recognised international standards.Again, it applies to the certified textile components rather than automatically certifying the entire finished mattress.
OEKO-TEX® STANDARD 100
OEKO-TEX® STANDARD 100 focuses on testing finished textile products for a wide range of harmful substances.It is commonly used for fabrics, covers and textile components that come into close contact with skin.Rather than measuring whether something is organic, OEKO-TEX® helps assess whether the tested textile has been screened for a broad range of substances that could be harmful to human health under the standard’s testing criteria.
eco-INSTITUT®
eco-INSTITUT® is one of the certifications many parents researching VOCs become particularly interested in.Unlike certifications that focus primarily on whether a material is organic, eco-INSTITUT® places strong emphasis on emissions and selected harmful substances.For families concerned about indoor air quality, this type of independent testing provides additional reassurance that the certified material has been assessed against low-emission criteria.
At Milari Organics, our natural Dunlop latex is sourced from a supplier whose latex is certified by eco-INSTITUT®, complementing its GOLS certification.
No Single Certification Tells the Whole Story
One of the biggest misconceptions in the baby mattress industry is that a single certification can tell parents everything they need to know.
It can’t.
Each certification answers a different question.
Some relate to organic materials.
Some relate to textiles.
Some relate to emissions.
Some relate to manufacturing processes.
That’s why it’s helpful to look at certifications together, alongside transparent material disclosure, independent firmness testing and clear explanations of why each material has been chosen.
Certifications Are One Piece of the Puzzle
A thoughtfully designed baby mattress is about more than collecting logos.
Parents should also consider:
* The materials used.
* How each material contributes to the overall sleep system.
* Whether the mattress has been independently firmness tested.
* Whether the manufacturer clearly explains every layer.
* Whether the product has been designed for breathability, practicality and durability.
Certifications are valuable because they help verify specific aspects of a product—but they are most meaningful when combined with transparency and thoughtful design.
✓ Key Takeaways
* Different certifications assess different things.
* No single certification tells the complete story.
* Look for certifications that relate to the actual materials used.
* Combine certification information with material transparency, firmness testing and thoughtful product design.
* The more clearly a manufacturer explains its materials and certifications, the easier it becomes to make an informed decision.
Every Material Should Earn Its Place
There is no single material that can do everything a baby mattress needs to do.A safe cot mattress must be firm enough to support infant sleep, breathable enough to encourage airflow, durable enough to maintain its shape over time and practical enough for everyday family life.
That’s why premium mattresses are often designed as a complete sleep system, with each layer performing a specific function. At Milari Organics, we don’t believe materials should be chosen simply because they sound impressive.We believe every material should earn its place.Every layer inside our mattresses has been carefully selected for a reason—and we’re proud to explain exactly why it’s there.
Organic Coconut Coir
The Foundation of the Mattress
Every great mattress starts with a strong foundation. At the heart of every Milari mattress is organic coconut coir—a naturally resilient fibre made from the husk of coconuts.
Unlike conventional foam cores, coconut coir forms an open, fibrous structure that allows air to move naturally throughout the mattress while providing the structural firmness essential for infant sleep.This unique combination of firmness and breathability is one of the reasons coconut coir has become increasingly popular in premium natural baby mattresses.
Why we chose it:
✓ Naturally firm
✓ Excellent airflow
✓ Durable support
✓ Renewable natural material
GOLS-Certified Natural Dunlop Latex
Responsive Support Without Polyurethane Foam
Above the coconut coir sits a layer of GOLS-certified natural Dunlop latex.Harvested from the sap of rubber trees, natural latex provides resilient support while maintaining the firmness required for infant sleep.Unlike memory foam, natural latex responds immediately to movement rather than creating a slow-sinking sensation.Its naturally open-cell structure also contributes to airflow throughout the mattress.
At Milari Organics, our natural Dunlop latex is sourced from a supplier whose latex is both GOLS-certified and eco-INSTITUT® certified, providing independent assurance relating to both organic latex standards and low-emission performance.
Why we chose it:
✓ Naturally resilient
✓ Breathable structure
✓ Durable and long-lasting
✓ Independently certified
Australian Wool
Nature’s Temperature Regulator
Australian wool performs several important roles within the mattress.Its fibres help manage moisture and assist with temperature regulation, contributing to a comfortable sleep environment across changing seasons.Wool also serves as our natural fire barrier, allowing us to avoid the use of added chemical flame-retardant treatments within the mattress itself.This reflects our belief that natural materials can often perform multiple functions when thoughtfully incorporated into the overall design.
Why we chose it:
✓ Naturally breathable
✓ Helps regulate temperature
✓ Assists with moisture management
✓ Natural fire barrier
GOTS-Certified Organic Cotton
The Mattress’s Protective Inner Layer
Surrounding the mattress is a GOTS-certified organic cotton inner cover.This breathable layer encloses the natural mattress materials while maintaining the integrity of the organic sleep system beneath the removable outer cover.Parents often don’t see this inner cover, but it plays an important role in protecting the mattress core while preserving breathability.
Why we chose it:
✓ Organic textile
✓ Soft and breathable
✓ Protects the mattress core
✓ Independently certified
A Sleep System, Not Just a Mattress
One of the biggest misconceptions about baby mattresses is that a single material determines how well a mattress performs.
In reality, the best-performing mattresses are designed as systems.
Each layer contributes something different.
Coconut coir provides structural firmness and airflow.
Natural Dunlop latex adds resilient support.
Australian wool assists with temperature regulation while acting as a natural fire barrier.The GOTS-certified organic cotton inner cover protects and encloses the mattress core.Together, these materials create a balanced sleep system designed to support firmness, breathability, durability and everyday practicality.
Rather than relying on one material to do everything, we’ve chosen materials that complement one another—because we believe thoughtful design is about understanding how every layer works together.
✓ Key Takeaways
* No single material can perform every function required of a baby mattress.
* Each layer within a premium mattress should contribute a specific benefit.
* Natural materials can work together to provide firmness, breathability and durability.
* At Milari Organics, every material has been selected with intention—and we’re transparent about why it’s there.
The Story Behind Our Signature Pebble™ Cover
Every detail of a baby mattress should serve a purpose.
For us, that philosophy extends far beyond the mattress core.
Our signature Tencel™ Pebble™ Cover wasn’t designed simply to look beautiful. It was carefully engineered to become an integral part of the Milari sleep system—combining breathability, practicality and everyday durability in one thoughtfully designed removable cover.
More Than a Beautiful Design
At first glance, the Pebble™ pattern is one of the most distinctive features of a Milari mattress.Look a little closer, however, and you’ll discover that every pebble has a purpose.Rather than creating a completely flat sleeping surface, the three-dimensional Pebble™ design forms thousands of tiny air channels between your baby and the mattress surface.These air channels encourage air to circulate more freely around the sleep surface while working together with the breathable layers beneath.
Combined with our organic coconut coir core, GOLS-certified natural Dunlop latex, Australian wool and GOTS-certified organic cotton inner cover, the Pebble™ surface forms part of a complete Surface-to-Core Airflow™ Sleep System.Because breathability isn’t created by one material alone.
Why We Chose Tencel™
The surface your baby sleeps on is made from Tencel™, a premium fibre derived from sustainably sourced wood.We chose Tencel™ because it complements the breathable design philosophy of the entire mattress.
It is valued for its:
✓ Soft, silky feel against delicate skin
✓ Excellent breathability
✓ Moisture management properties
✓ Durability for everyday family life
The Tencel™ sleep surface works together with the Pebble™ design to help maintain airflow across the surface of the mattress while providing a beautifully soft place for your baby to rest.
Practical Protection Without Compromising Breathability
Life with babies is beautifully unpredictable.
Milk spills.
Leaking nappies.
Reflux.
Everyday little accidents are all part of parenting.
Many parents purchasing a premium cot mattress discover they also need to buy a separate mattress protector.We wanted to make life simpler.That’s why every Milari mattress includes our removable Pebble™ Cover as standard, giving parents the flexibility to use it from day one or remove it entirely if they prefer.
Rather than relying on a traditional waterproof membrane—which can reduce airflow—we developed a breathable, water-resistant cover designed to work with the mattress, not against it.
To provide practical everyday protection, the cover incorporates Nanosphere® technology, a premium textile finish inspired by the self-cleaning properties found in nature. This innovative finish helps liquids bead on the surface, giving parents valuable time to wipe away everyday spills while preserving the breathable nature of the cover.
Why Does the Pebble™ Cover Contain a Small Amount of Recycled Polyester?
It’s a question we’re always happy to answer.Natural fibres are wonderful, but repeated machine washing can cause them to shrink and lose dimensional stability over time.
Because we wanted every Pebble™ Cover to remain removable, washable and easy to refit after years of everyday family use, we made a deliberate engineering decision.A small amount of recycled polyester is incorporated within the internal Pebble™ structure only.
Its role is simple:to help the cover retain its shape and durability through repeated washing.Importantly, this recycled polyester is fully enclosed within the internal Pebble™ structure and does not come into direct contact with your baby’s skin.
The sleeping surface your baby touches is the soft, breathable Tencel™ fabric.
An Organic Mattress. A Practical Choice.Beneath the removable Pebble™ Cover, the mattress itself remains enclosed within its GOTS-certified organic cotton inner cover, surrounding the carefully selected organic and natural materials that form the mattress core.
This gives parents genuine flexibility.Use the included Pebble™ Cover for everyday protection.Or remove it entirely if you prefer your baby to sleep directly on the organic cotton inner cover.There’s no need to purchase an additional protector unless you choose to.
We believe parents should have that choice.
Every Design Decision Has a Reason
Throughout this guide we’ve spoken about transparency.
For us, transparency means more than listing materials.
It means explaining every decision.
Why organic coconut coir?
Why natural Dunlop latex?
Why Australian wool?
Why GOTS-certified organic cotton?
Why Tencel™?
Why Nanosphere® technology?
Why is a small amount of recycled polyester hidden safely within the Pebble™ structure?
Every answer is the same.
Because every material has been selected to perform a specific function within the Milari sleep system.
Every material has earned its place.
And every parent deserves to know exactly why.
🌿 Parent Tip
When comparing baby mattresses, look beyond whether a removable cover is included.
Ask how it has been designed.
Does it support breathability?
Is it machine washable?
What materials does your baby actually come into contact with?
Can the manufacturer clearly explain every layer?
The answers often reveal far more than a list of product features.
✓ Key Takeaways
* The Pebble™ Cover is an integral part of the Milari sleep system—not simply a mattress protector.
* The three-dimensional Pebble™ design helps encourage airflow across the sleep surface while working with the breathable mattress layers beneath.
* The sleeping surface your baby touches is made from soft, breathable Tencel™.
* Nanosphere® technology provides practical water resistance without relying on a waterproof plastic membrane.
* A small amount of recycled polyester is enclosed within the internal Pebble™ structure to improve durability through repeated washing and never comes into direct contact with your baby’s skin.
* Every material has been thoughtfully selected with one goal: to create a breathable, practical and beautifully engineered sleep environment for growing dreamers.
How to Choose a Low-VOC Baby Mattress?
With so many marketing claims, certifications and material combinations available, it’s easy to wonder where to begin.The good news is that you don’t need to become an expert in mattress manufacturing to make an informed decision.By asking a few thoughtful questions, you can better understand how a mattress has been designed and whether it aligns with your family’s priorities.
1. Start With the Materials
The mattress core is one of the most important parts of the mattress, yet it’s often hidden beneath the cover.
Ask the manufacturer:
* What materials make up the mattress core?
* Does it contain polyurethane foam or memory foam?
* Does it use natural latex, coconut coir, wool or organic cotton?
* Can every layer be clearly explained?
A transparent manufacturer should be happy to walk you through the construction of the mattress and explain the purpose of each layer.
2. Look Beyond Marketing Claims
Words such as natural, organic, eco, green and plant-based can be helpful starting points—but they don’t always tell the full story.
Instead, look for brands that explain:
* what materials are used
* why those materials were chosen
* which certifications apply
* how the mattress has been independently tested
The more transparent the information, the easier it becomes to compare products objectively.
3. Understand the Certifications
Not every certification measures the same thing.
Some relate to organic raw materials.
Others assess textiles.
Some focus on emissions.
Others verify manufacturing standards.
Understanding what each certification actually covers will help you interpret product claims with greater confidence.
4. Check for Independent Firmness Testing
A mattress can contain beautiful materials, but it must also provide a sleep surface suitable for infants.
In Australia, many parents look for mattresses that have been independently tested to AS/NZS 8811.1:2013, the voluntary infant mattress firmness standard.
Firmness should always remain one of the most important considerations when choosing a cot mattress.
5. Consider Breathability
Breathability is influenced by the entire mattress—not just one material.
Look at how the mattress has been designed as a complete sleep system.
Ask yourself:
* Does the sleep surface encourage airflow?
* Are the internal materials naturally breathable?
* Does the design avoid unnecessary barriers that could restrict airflow?
* Is the cover removable and breathable?
Every layer contributes to the overall performance of the mattress.
6. Think About Everyday Practicality
Life with babies is wonderfully messy.
A thoughtfully designed mattress should also make life easier for parents.
Consider questions such as:
* Is the cover removable?
* Is it machine washable?
* Does it provide practical protection from everyday spills?
* Will I need to purchase a separate mattress protector?
Practicality is often just as important as the materials themselves.
7. Read the Legal Label
One of the simplest ways to understand a mattress is to read its legal label.
The legal label identifies the materials used within the mattress and provides another layer of transparency beyond the marketing description.
If you can’t easily find it, ask the manufacturer.
They should be happy to explain it.
8. Choose a Brand That Values Transparency
Perhaps the most important question isn’t:
“Which mattress is the best?”
It’s:
“Which manufacturer is willing to explain every design decision?”
A company that openly discusses its materials, certifications, testing and construction is giving parents the information they need to make their own informed decision.That’s exactly how it should be.
Choosing With Confidence
There is no single feature that makes a baby mattress exceptional.
Instead, it’s the combination of thoughtful design, carefully selected materials, independent testing, practical functionality and honest communication that creates confidence.
When parents understand what is inside a mattress and why those materials have been chosen, marketing becomes far less important.Knowledge becomes the deciding factor.
✓ Parent’s Checklist
Before purchasing a baby mattress, ask yourself:
☐ Do I understand what the mattress is made from?
☐ Can the manufacturer explain every layer?
☐ Are the materials independently certified where appropriate?
☐ Has the mattress been independently firmness tested?
☐ Is the design breathable from surface to core?
☐ Is the cover practical for everyday family life?
☐ Does the legal label align with the product description?
☐ Do I trust the transparency of the brand?
If you can confidently answer “yes” to these questions, you’re already well on your way to making an informed decision.
Frequently Asked Questions
Do all baby mattresses contain VOCs?
Not necessarily, and not all VOCs are the same.
Many everyday household products—including paints, furniture, flooring and some mattresses—can release volatile organic compounds (VOCs). The type and amount of VOCs released depends on the materials used and how they have been manufactured.
Rather than asking whether a mattress contains any VOCs at all, it is often more helpful to understand the materials used, whether they have been independently tested where appropriate, and how transparent the manufacturer is about their construction.
What is off-gassing?
Off-gassing is the process by which volatile compounds are released from certain materials into the surrounding air.
It is commonly associated with the “new product smell” noticed when opening items such as mattresses, furniture, carpets or freshly painted products.
Many products release the highest levels shortly after manufacture, with emissions generally reducing over time.
Why do some new mattresses smell?
A new mattress may have a noticeable smell for a variety of reasons.
Natural materials such as wool or natural latex have their own distinctive aromas, while synthetic foams, adhesives and some textile treatments may produce different odours.
Because smell alone doesn’t identify the source, it should not be used as the only way to judge a mattress.
Understanding the materials and any relevant certifications provides a much clearer picture.
Is the natural smell of latex harmful?
Natural Dunlop latex has its own characteristic scent, which comes from the rubber tree sap used to produce it.
This natural aroma is different from the chemical odours often associated with some synthetic foams and adhesives.
Our natural Dunlop latex is sourced from a supplier whose latex is both GOLS-certified and eco-INSTITUT® certified, providing independent assurance relating to the material itself.
Is natural latex the same as memory foam?
No.
Natural latex is made from the sap of rubber trees.
Memory foam is a type of polyurethane foam that has been formulated to respond slowly to pressure and body heat.
They differ in both their composition and how they perform.
What is polyurethane foam?
Polyurethane foam is a widely used cushioning material found in many mattresses and upholstered products.
It is primarily derived from petrochemical ingredients, although formulations vary between manufacturers.
Many parents researching baby mattresses choose to understand whether polyurethane foam is used and, if so, what independent testing or certifications support the finished product.
What does “plant-based foam” mean?
Plant-based, soy or green foams often contain a proportion of plant-derived ingredients within a polyurethane foam formulation.
These terms can be confusing because they do not necessarily mean the foam is entirely natural.
If you’re unsure, ask the manufacturer to explain exactly what the foam is made from.
Why is breathability important in a baby mattress?
Breathability helps air move through and across the mattress.
Many parents choose breathable materials because they support airflow and help create a more comfortable sleep environment.
Breathability depends on the design of the entire mattress—not just one material.
What certifications should I look for?
Different certifications assess different things.
For example:
* GOLS relates to organic natural latex.
* GOTS relates to organic textiles.
* OEKO-TEX® STANDARD 100 assesses textiles for a wide range of harmful substances.
* eco-INSTITUT® focuses on emissions and selected harmful substances.
No single certification tells the whole story, so it’s helpful to consider them alongside the mattress materials and overall design.
Why does the legal label matter?
The legal label identifies the materials used in the mattress.
While it doesn’t explain why those materials were chosen, it provides a useful starting point for understanding what is inside and asking informed questions.
Does a breathable mattress need to be waterproof?
Not necessarily.
Many parents prefer a breathable, water-resistant removable cover rather than relying on a fully waterproof membrane.
The right choice depends on your family’s needs and the design philosophy of the mattress.
Why does Milari use a removable Pebble™ Cover?
We wanted to give parents a practical solution for everyday family life without compromising breathability.
Our removable Tencel™ Pebble™ Cover is machine washable, water-resistant and designed to work as part of the overall sleep system.
Parents can choose to use it every day or remove it entirely, revealing the mattress enclosed within its GOTS-certified organic cotton inner cover.
Why does the Pebble™ Cover contain a small amount of recycled polyester?
A small amount of recycled polyester is incorporated within the internal Pebble™ structure only to help the removable cover maintain its shape and durability through repeated machine washing.
Importantly, it is fully enclosed within the pebble structure and does not come into direct contact with your baby’s skin.
The sleep surface your baby touches is the breathable Tencel™ fabric.
Does the Pebble™ Cover make the mattress less organic?
No.
The mattress itself remains enclosed within its GOTS-certified organic cotton inner cover, surrounding the carefully selected organic and natural materials that form the mattress core.
The removable Pebble™ Cover is a practical outer layer designed to give parents flexibility and everyday protection. Parents can choose to use it or remove it according to their preferences.
What makes a quality baby mattress?
There is no single feature that defines a quality baby mattress.
Instead, look at the complete picture:
* Thoughtfully selected materials.
* Independent certifications where appropriate.
* Firmness testing.
* Breathable design.
* Practical functionality.
* Transparency about construction.
* A manufacturer willing to explain every design decision.
Final Thoughts
Choosing a baby mattress isn’t about finding the product with the longest list of marketing claims.
It’s about understanding the materials your baby will spend thousands of hours sleeping on, knowing which questions to ask, and choosing a manufacturer that is open and transparent about every design decision.
As you’ve discovered throughout this guide, there is no single feature that makes a baby mattress exceptional.
It’s the combination of thoughtful design, carefully selected materials, independent certifications, firmness, breathability and practical everyday functionality that creates a complete sleep system.
Most importantly, it’s about transparency.
A manufacturer should be able to explain not only what is inside a mattress, but why each material has been chosen.
That philosophy has guided every decision we’ve made at Milari Organics.
From our organic coconut coir core and GOLS-certified natural Dunlop latex, to Australian wool, our GOTS-certified organic cotton inner cover and our signature removable Tencel™ Pebble™ Cover, every layer has been selected with intention.
Some materials were chosen because they naturally provide firmness.
Others because they support breathability.
Others because they make everyday family life a little easier.
Even the smallest design decisions—such as incorporating a small amount of recycled polyester within the internal Pebble™ structure of our removable cover—were made for a clear reason, and we’re proud to explain exactly why.Because we believe parents deserve complete transparency.
Our Philosophy
At Milari Organics, we believe a baby mattress should do more than provide a comfortable place to sleep.
It should be thoughtfully designed.
Beautifully made.
Independently tested.
Honest about its materials.
Practical for everyday family life.
And created with the understanding that every layer matters.
We don’t believe in adding materials simply because they’re fashionable.
We believe every material should earn its place.
A Final Thought for Parents
There will always be new products.
New marketing claims.
New trends.
But one thing never changes.
The best decisions are informed decisions.
Whether you choose a Milari mattress or another brand, we hope this guide has given you the confidence to look beyond advertising, ask thoughtful questions and better understand the materials your baby will spend so much time sleeping on.Because when parents are informed, everyone sleeps a little easier.
Visit the Milari Learning Centre for more evidence-based guides, including:
* Ultimate Guide to Choosing a Safe Cot Mattress in Australia
* Why Firmness Matters in a Baby Cot Mattress
* Why Breathability Matters in a Baby Cot Mattress
* What Is Coconut Coir and Why Is It Used in Premium Cot Mattresses?
* Organic Cotton vs Conventional Cotton
* Wool vs Chemical Flame Retardants
* Foam vs Natural Latex: Which Traps Less Heat?
* How to Choose a Low-VOC Baby Mattress in Australia
* What Is eco-INSTITUT®?
* What Is GOLS?
* What Is GOTS?
* What Is OEKO-TEX® STANDARD 100?
Thank you for taking the time to learn more about safer sleep.
Every question you ask today helps you make a more informed choice for tomorrow.
And that’s something every growing dreamer deserves.
Also in News
