What Is a Breathable Mattress? Features, Benefits and How to Choose One

If you've been shopping for a mattress in Australia, you've probably seen "breathable" used as a benefit claim on almost every product page. It's a genuine feature that affects how comfortable your bed feels — but breathability isn't the same as cooling, and a breathable mattress on its own doesn't guarantee a cool, comfortable night. Your bed base, pillow, sheets and quilt all shape airflow through your sleep setup, and the way each layer performs matters as much as the mattress itself. This guide explains what actually makes a mattress breathable, how the rest of your sleep setup affects felt airflow, and how to choose the right combination for a more comfortable Australian bedroom.

A breathable mattress is designed to promote airflow and reduce heat build-up while you sleep, using materials and construction that support ventilation and moisture management. Open-cell foams, hybrid coil cores, breathable covers and ventilated bed bases all contribute to how breathable a bed feels. The best breathable mattress depends on your sleeping position, comfort preferences and the rest of your sleep setup — including pillows, bedding and your bed base — because a breathable mattress works best in a breathable sleep environment.

Key takeaways

• Breathability describes airflow through a mattress — how easily air moves through the material and away from your body

• Breathability isn't the same as cooling — cooling is active heat management (gel, phase-change materials), breathability is passive airflow

• Open-cell foams, hybrids, and latex tend to be the most breathable mattress constructions — traditional closed-cell memory foam is the least breathable

• Koala's Kloudcell® is an open-cell foam — 30× more breathable than worst-performing competitor foams per product pages

• A breathable mattress works best in a breathable sleep environment — bed base airflow, pillow fill, sheets, quilt and mattress protector all contribute

• Bed base airflow is commonly overlooked — slatted bases like the Koala Kirribilli are designed to maximise airflow under the mattress

• Personal comfort and temperature preferences vary — the right breathable setup depends on how you sleep

What is a breathable mattress?

A breathable mattress is one designed to promote airflow through the mattress structure, allowing warm air and moisture to move away from your body during sleep. It's built with materials and construction that support ventilation — open-cell foam structures, hybrid coil systems, natural fibre covers — rather than trapping heat close to your skin.

Two important distinctions before we go further:

Breathability isn't a formal mattress category. Like "adaptive mattress," "breathable mattress" describes a set of performance features rather than a specific construction type. Any construction can be breathable if it delivers airflow — though some (open-cell foam, hybrids) are inherently more breathable than others (closed-cell memory foam).

Breathability isn't the same as cooling. These terms often get used interchangeably, but they refer to different mechanisms:

• Breathability = passive airflow through the mattress structure

• Cooling = active heat management (gel infusion, phase-change materials, cooling toppers)

A mattress can be highly breathable without being actively cooling, and vice versa. For a dedicated cooling framework, see our what is a cooling mattress guide.

Why breathability matters

Your body temperature naturally drops overnight — that drop is one of the signals your body uses to trigger and maintain sleep. A mattress that traps heat close to your body can disrupt this natural cooling process, leading to shallow sleep or overnight wake-ups. Breathable mattresses help by letting body heat escape into the surrounding air rather than accumulating in the top comfort layers.

Beyond temperature, breathability also affects moisture management. During sleep, your body releases moisture through the skin. In an Australian climate with humid summers, that moisture needs somewhere to go — breathable mattress structures and breathable bedding help move it away from your body and out of the bed rather than trapping it in the foam.

Breathability also contributes to mattress freshness over time. Breathable mattresses tend to develop less moisture-related odour and mildew when paired with a quality mattress protector.

Finally, breathability affects felt comfort. A breathable mattress typically feels cooler on first contact and stays more comfortable through the night — even if the actual surface temperature isn't dramatically different from a less-breathable mattress. Individual comfort and temperature preferences vary from sleeper to sleeper.

What makes a mattress breathable?

Three interconnected factors determine how breathable a mattress actually is.

Materials

The materials in the comfort layer, support core, and cover fabric each affect airflow:

• Open-cell foam (like Koala's Kloudcell®) has interconnected air pockets that let air move through the material — dramatically more breathable than closed-cell foam

• Latex has a natural pin-core structure that allows airflow, plus the material itself is more breathable than polyurethane foam

• Innerspring coils create air cavities inside the mattress that allow substantial airflow

• Cover fabrics matter too — cotton, TENCEL™ Lyocell, bamboo, and Australian Cashmere blends breathe more than polyester or synthetic-heavy covers

Construction

How the materials are layered affects airflow through the whole structure:

• Hybrid constructions combine coil airflow with foam comfort — high breathability overall

• All-foam mattresses rely entirely on the foam's cell structure — open-cell design is critical here

• Ventilation channels cut into some foam layers actively promote airflow

• Layered comfort structure — thin, dense comfort layers over airflow-friendly support cores breathe better than thick, dense foam blocks

Airflow mechanisms

The mechanisms that move air through the mattress:

• Cell interconnection — open-cell foam allows air to pass through the material rather than trapping it

• Coil cavities — the empty space between pocket coils lets air circulate freely

• Ventilation channels — physical air pathways cut into foam or through the sides of the mattress

• Cover-fabric weave — how tightly the cover is woven affects how easily air moves through the top surface

Which mattress materials are most breathable?

Two notes on the comparison:

Traditional memory foam sleeps the warmest of the mainstream constructions because its closed-cell structure inherently traps air. Modern memory foam variants often include gel infusion, open-cell modifications, or ventilation channels to address this — but at the material level, closed-cell memory foam is the least breathable option.

Open-cell foam (Kloudcell® and similar) sits between traditional memory foam and hybrid on the airflow axis. It's engineered to give sleepers foam-style contouring and pressure relief without the heat retention of closed-cell memory foam. For a deeper foam-category breakdown, see our viscoelastic vs memory foam vs open-cell foam guide.

How bedding affects breathability

Bedding shapes airflow between you and the mattress. A breathable mattress paired with a synthetic-heavy quilt and non-breathable sheets can feel less breathable than a moderate-airflow mattress paired with breathable bedding.

Sheets. Natural fibres breathe best. Bamboo is moisture-wicking and breathable — cool on first contact. Cotton is broadly breathable and durable. Linen breathes exceptionally well and has thermal-regulating properties (cool in summer, insulating in winter). TENCEL™ Lyocell moisture-wicks and breathes. For a full bamboo sheets framework, see our best bamboo sheets Australia guide.

Quilt or doona. Fill material and weight both matter. Down and wool fills breathe better than synthetic fills at equivalent weight. Lower TOG (2.5-4.5) suits summer; higher TOG (10.5+) is winter-weight. For a full doona/quilt framework, see our doona guide Australia.

Mattress protector. This is the critical layer that most people overlook. A polyester-heavy waterproof mattress protector can undermine the breathability of the mattress underneath it. Look for TENCEL™ Lyocell or cotton-blend protectors that maintain airflow while still protecting from spills. The Koala Great Barrier Mattress Protector is made from TENCEL™ Lyocell fibres, keeping the protective layer breathable. For a full framework, see our best mattress protector Australia guide.

Choosing the right pillow for breathability

Pillow choice affects breathability at the top of the bed — where the head and neck generate substantial heat during sleep.

Loft. A very high-loft solid memory foam pillow can trap heat around the head, undermining the mattress's breathability. Adjustable-loft pillows let you tune the pillow to a height that supports your neck without over-insulating the head.

Fill material. Down, wool, latex, shredded foam, and open-cell foam all breathe more than solid closed-cell memory foam. Fill materials with air pockets circulate more air; solid dense fills trap it.

Cover fabric. Cotton, TENCEL™ Lyocell, and bamboo covers breathe more than polyester. The pillow's outer fabric affects the surface temperature you actually feel against your skin.

The Koala Pillow (2nd Gen) is engineered with PolarBands® — thermal highways designed to draw heat away from the pillow surface — and a CoolThread™ summer side that feels cool to the touch. Koala R&D testing found the Summer Side surface achieved a temperature 2.73°C cooler than the previous-generation Koala Pillow after 6 hours of use. The pillow also has an adjustable insert design that lets you tune loft to your preference. For a broader pillow framework, see our body pillow guide.

Does your bed base affect airflow?

Yes — and this is the layer most people overlook when thinking about mattress breathability.

The mattress can be highly breathable at the top, but if the base underneath doesn't let air move away, moisture and heat can accumulate below the mattress over time. That reduces the mattress's overall airflow performance and, in humid conditions, can contribute to moisture retention on the underside of the mattress.

Slatted bed bases. Slatted timber bases (like the Koala Kirribilli, Balmain, Paddington, and Brunswick) leave gaps between individual slats that let air move underneath the mattress. The Koala Kirribilli Bed Base product page specifically calls out that it's designed to "maximise airflow and storage." This is a key differentiator vs solid platforms.

Solid platforms. A solid platform base or a mattress on the floor restricts airflow underneath the mattress. Over time, this can reduce breathability performance and — in humid conditions — increase the risk of moisture retention.

Slat spacing. Slats that are too far apart can undermine foam mattress support; slats too close together restrict airflow. Most mattress manufacturers recommend a moderate spacing that balances both concerns. Check the specific bed base and mattress specifications for guidance.

Cross-link to explore Koala Bed Bases — all Koala bed bases use slatted designs engineered for airflow. For the broader bed frame framework, see our bed frame buying guide.

How to create a more breathable sleep environment

A breathable mattress is one component of a system. To maximise felt airflow across your whole sleep setup:

Mattress. Choose open-cell foam or hybrid construction. Look for CertiPUR-US® certified foams.

Bed base. Choose a slatted design that allows air to move underneath the mattress.

Pillow. Choose breathable fill (open-cell foam, down, wool) and breathable cover fabric (cotton, TENCEL™, bamboo).

Sheets. Choose natural fibre sheets (cotton, bamboo, linen, TENCEL™) over synthetic.

Quilt/doona. Choose down, wool, or natural-fibre fill. Match TOG to season.

Mattress protector. Choose TENCEL™ Lyocell or cotton-blend rather than polyester-heavy waterproof designs.

Bedroom. Ventilate the bedroom (Sleep Health Foundation guidance recommends 17-19°C for sleep). Even the most breathable sleep setup underperforms in a poorly-ventilated, overly-warm bedroom.

Sofa beds — for guest rooms and multifunctional spaces. If you're furnishing a guest room or a multifunctional space, choosing a breathable sofa bed mattress can help guests stay comfortable during overnight stays. Explore Koala's sofa bed range for options.

Common mistakes when shopping for a breathable mattress

Why consider Koala's sleep products?

Every Koala mattress is built on Kloudcell® open-cell foam — engineered specifically for airflow. Koala product pages describe Kloudcell® as 30× more breathable than worst-performing competitor foams. The range then layers different comfort features on top for different sleep priorities.

Mattress range:

• Koala Mattress (Core) — Kloudcell® foundation. ProductReview Mattress of the Year 2023, 2024 + 2025 — three-year streak.

• Koala Plus — Cooling Gel Kloudcell® plus CoolThread™ topper. Sleeps 13% cooler than leading online brands (per product page).

• Koala Polar+ — PolarBands™ plus Cooling Kloudcell®. Sleeps up to 5°C cooler than the Plus (per product page).

• Koala Luxe — 9cm Kloudcell® plus 7 multi-layered support zones (per Luxe product page) plus copper-infused plus phase-change temperature control plus Australian Cashmere blend cover.

• Koala SE — CHOICE®-Recommended entry-tier Kloudcell® pick.

Bed base range:

• Koala Bed Bases — all Koala bed bases use slatted designs. The Kirribilli Bed Base is specifically designed to maximise airflow and storage.

Pillow:

• Koala Pillow (2nd Gen) — PolarBands® thermal highways plus CoolThread™ summer side. Sleeps 2.73°C cooler than the previous-generation Koala Pillow after 6 hours of use (per Koala R&D testing).

Bedding:

• Koala Bed Covers & Sheets — TENCEL™ Lyocell duvet cover sets and All Seasons Duvet. Sustainable materials, breathable weaves.

• Koala Mattress Protectors — TENCEL™ Lyocell fibres. The Great Barrier Mattress Protector maintains airflow while still protecting from spills, moisture and allergens.

All Koala mattresses ship with our 120-day trial and a 10-year warranty. All Koala foam is CertiPUR-US® certified — independently tested for low VOC emissions, no ozone depleters, no PBDE flame retardants.

The bottom line for breathable sleep setups

A breathable mattress is one part of a breathable sleep setup. Bed base, pillow, sheets, quilt, mattress protector, and even bedroom ventilation all shape how airflow feels across your whole bed. The best breathable setup depends on your personal comfort preferences, sleeping position, body type, and the climate you live in — comfort varies by sleeper. Focus on choosing components that each contribute to airflow rather than optimising one piece in isolation.

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Ready to build your breathable sleep setup?

Looking for a mattress designed for airflow? Explore Koala's mattress range, pillows, bedding and bed bases to build a sleep setup engineered for breathability and comfort. All Koala mattresses come with a 120-day trial and a 10-year warranty. To compare in person, visit our Koala Moore Park Showroom in Sydney.

Shop the Koala sleep essentials range →

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