Cooling Mattress Guide: How to Choose a Cooler Mattress for Hot Sleepers

Quick Answer: A cooling mattress can affect how warm you feel in bed, but the most important things to look for are breathable materials, good airflow, and a construction that lets heat escape instead of trapping it around your body.

Nothing's more frustrating than climbing into bed feeling comfortable, only to wake up a few hours later feeling far too warm. You throw off the duvet, turn your pillow over and spend the rest of the night trying to find a cooler spot.

If this sounds familiar, you're certainly not alone. Several everyday reasons might make you feel hot at night, and your mattress isn't necessarily the only culprit.

Why Do You Get Hot at Night?

Your bedroom temperature is one of the biggest factors. A room that feels pleasant when you're getting ready for bed can become uncomfortable once you're tucked underneath your duvet.

Your bedding also makes a difference. Thick duvets, heavy blankets, and certain synthetic fabrics can trap heat close to your body, especially during warmer months. Even your evening routine can influence how comfortable you feel. Exercising shortly before bed, taking a hot bath, or settling into a room heated throughout the evening can leave you feeling warmer than you'd like.

Before replacing your mattress, consider these factors. Sometimes, a few small changes to your sleeping environment can make a noticeable difference.

Does Your Mattress Affect How Hot You Sleep?

Yes, your mattress can affect how warm you feel throughout the night.

Different mattress materials respond to body heat differently. Some have dense structures that restrict airflow, while others are designed with spaces that allow air to move more freely.

When you lie on a mattress, your body naturally transfers warmth into the materials beneath you. If that warmth struggles to disperse, the sleeping surface may begin to feel uncomfortable. How deeply you sink into your mattress can also influence your experience. A surface that closely surrounds your body may reduce the amount of exposed skin available for heat to escape.

However, remember that no mattress works in isolation. Your duvet, mattress protector, sheets, and bedroom temperature all shape your overall sleeping environment. That is why choosing a cooler mattress means looking beyond the product name and understanding what's actually inside.

What Makes a Mattress Sleep Cooler?

When shopping for a mattress, you'll probably come across plenty of products described as cooling, breathable or temperature-regulating. Although these descriptions sound appealing, they're not always particularly helpful on their own.

Understanding the materials and construction gives you a much clearer idea of what you're buying.

Airflow and Open Cell Foam

Airflow matters when choosing a mattress, especially if you often feel too warm in bed. Traditional dense foams can restrict airflow, making it harder for heat to dissipate.

Open cell foam is designed differently. Its structure includes interconnected spaces that let air pass through more easily. This can improve breathability within the foam itself, though better airflow doesn't automatically mean a mattress will keep you cooler while you sleep.

Other components, including the cover and additional comfort layers, still influence the finished product.

The Mattress Cover

It's easy to focus entirely on what's inside a mattress, but the cover deserves attention too. After all, it's the mattress's outermost layer and sits directly beneath your bedding. A breathable cover supports airflow, while a thick or tightly constructed cover may restrict it.

Look at the materials used and whether the manufacturer explains their purpose. Remember that even a breathable mattress cover can be affected by the protector and sheets placed over it.

Mattress Type and Construction

How a mattress is built can be as important as the materials themselves. Pocket sprung mattresses have spaces between their springs, allowing air to circulate through the interior. Foam mattresses vary considerably depending on their density, cell structure, and layer arrangement.

Hybrid mattresses combine springs with comfort materials, potentially offering airflow through the springs while the upper layers provide cushioning.

Here's a simple comparison:

Ultimately, assess the complete mattress rather than assuming one type will always feel cooler.

Do Memory Foam Mattresses Sleep Hot?

Memory foam has developed a reputation for keeping you warm, and there's a reason for it.

Traditional memory foam is known for its dense structure and ability to contour closely around the body. While this can feel comfortable and cushioned, it may also restrict airflow and trap heat.

However, not all memory foam is made in the same way. Modern foam designs can incorporate open-cell structures to improve airflow through the material.

This means it's worth looking at the specific foam being used rather than dismissing every memory foam mattress as unsuitable for warmer sleepers. Remember, a mattress with breathable foam isn't guaranteed to feel cool. Overall design, bedding, and room conditions remain important.

Are Cooling Mattresses Worth It?

If you regularly overheat in bed, it's understandable that a mattress advertised as cooling might catch your attention.

However, be cautious about what you're being promised.

Terms such as cooling technology and temperature regulation can sound impressive, but they don't always explain how the mattress performs or what evidence supports the claim. Some manufacturers use specialised covers, gel-infused foams or breathable constructions. These features may influence heat transfer or airflow, but their effectiveness can vary.

Before making a decision, look for clear explanations of the materials and any relevant testing. Check whether the evidence relates to an individual component or the complete mattress. For example, testing airflow through a piece of foam isn't the same as showing that a finished mattress keeps someone cooler overnight.

A cooling mattress may be worth considering if its construction suits your needs, but don't pay extra simply because the marketing sounds convincing. Comfort, support, durability and suitability for your sleeping position should still play an important role in your decision.

How True Rest Approaches Airflow

At True Rest, we focus on how mattress materials perform rather than on impressive-sounding descriptions. Every True Rest mattress features a three-layer foam construction: a supportive foundation, pressure-relieving memory foam, and an Aurora® Foam comfort layer.

Aurora Foam has an open cell structure designed to improve breathability. Independent laboratory testing shows Aurora Foam allows about four times more airflow through the foam than standard memory foam.

That's a useful distinction, but it's important to understand exactly what it means. The result measures airflow through the foam material itself. It doesn't measure the temperature of someone sleeping on a completed True Rest mattress, nor does it establish that the finished mattress sleeps cooler.

Instead, it shows that the foam was developed with air movement in mind. The remaining layers provide cushioning and support, while the complete construction is designed to offer a balanced sleeping surface.

For more information about the mattress components and standards, explore True Rest's Materials & Certifications page.

Other Ways to Sleep Cooler

You don't always need a new mattress to make your bed feel more comfortable. Try a few straightforward changes first, especially if you've only recently started noticing overheating.

Keep your bedroom comfortably cool. A sleep guide from Shrewsbury and Telford Hospital NHS Trust suggests an ideal bedroom temperature of around 16 to 18°C, although personal preferences vary. You don’t need to force yourself to sleep in a room that feels uncomfortably cold.

Choose lighter bedding. Consider switching to a lower tog duvet during warmer weather. Breathable cotton or linen sheets may also feel more comfortable than heavier fabrics. Review your mattress protector. Waterproof protectors can contain layers that restrict airflow. If yours feels particularly warm, look for a more breathable alternative that still provides the protection you need.

Improve ventilation. When conditions allow, open a window or use a fan to make a stuffy bedroom feel more comfortable. Think about your evening routine. If vigorous exercise leaves you feeling warm, try finishing your workout earlier and giving yourself time to cool down before bed.

Avoid piling on unnecessary layers. Extra blankets, thick throws and heavy bedding can make an otherwise comfortable mattress feel much warmer. It's worth experimenting with these changes individually. That way, you can identify what's making a difference without spending money on products you might not need.

Conclusion

Choosing a cooler mattress is about more than finding a product with the word 'cooling' in its name.

Materials, airflow, mattress construction and the bedding you use all influence how warm your sleeping environment feels. If you're considering replacing your mattress, take time to understand how it's made and what any performance claims actually demonstrate.

At True Rest, we focus on carefully selected materials, supportive construction, and a breathable Aurora® Foam comfort layer. Airflow testing on the foam is not the same as proof of how cool the finished mattress sleeps, so we don’t make that claim. 

You can explore the thinking behind the design in The Science of Sleep, or read our Memory Foam vs Hybrid Mattress guide for a closer comparison of different constructions.

The aim is simple: find a mattress that feels comfortable, supports your body, and suits how you prefer to sleep.

Frequently Asked Questions (FAQs)

Do memory foam mattresses make you hot?

Some memory foam mattresses can feel warmer than others, particularly those made using traditional dense foam that restricts airflow. However, modern open-cell foams are designed to allow air to move more freely through the material. Overall mattress construction, bedding, and bedroom temperature also affect how warm you feel.

What is the best mattress for hot sleepers?

No single mattress is guaranteed to be best for every hot sleeper.

Look for breathable materials, good airflow and a construction that suits your comfort preferences. Pocket sprung and hybrid mattresses may offer better airflow through their spring cores, while some open-cell foam designs also prioritise breathability.

Does a mattress protector make you hotter?

It can, depending on the materials used.

Some waterproof mattress protectors contain membranes that restrict airflow and can make the sleeping surface feel warmer. If you regularly overheat, choose a breathable protector and lightweight bedding, while still keeping your mattress properly protected.

Can a mattress cause night sweats?

A mattress that retains heat may make you feel hot or sweaty at night, but night sweats can have several causes unrelated to your bedding. Changing your mattress isn't a treatment for night sweats. If you're experiencing persistent or unexplained night sweats, it's sensible to speak to your GP rather than assuming your mattress is responsible.

Are gel mattresses cooler?

Gel-infused mattresses are often marketed as offering improved temperature regulation, but their performance varies. Some gel materials may feel cooler at first or affect how heat moves through the foam. However, that doesn't necessarily mean they'll stay cooler all night. As with any mattress, consider the full construction and look for evidence that supports the manufacturer's claims.