Best Mattress for Hot Sleepers: What Should You Look For?

If you regularly wake up feeling too warm, it is natural to search for the 'coolest mattress'. The problem is that mattress temperature is not controlled by one material or one marketing label. How warm a bed feels depends on airflow, the comfort layers, the bedding on top, room temperature, humidity and your own body.

There is no single 'coolest mattress' for everyone

A mattress that feels beautifully breathable to one person can still feel warm to another. Hot sleeping can also be influenced by bedding, bedroom temperature, medications, hormonal changes and health conditions.

For mattress shopping, the most useful approach is to look for construction that allows air movement and materials that do not create an excessively heat-trapping sleep surface.

Look at the support system, not just the top fabric

A mattress with a spring support system has open space between the coils, which can allow more air movement through the core than a solid block of foam. Pocket springs also move independently, so the mattress can combine airflow with more individualised support.

That does not mean every spring mattress sleeps cool or every foam mattress sleeps hot. Comfort layers still matter. Thick, close-conforming foams can retain more body heat for some sleepers, while more breathable comfort materials may feel fresher.

Breathable natural fibres can help with comfort

Wool is widely used in bedding because it can manage moisture vapour and respond to changing temperature conditions. In a mattress comfort layer, merino wool can contribute to a breathable, natural-feeling surface.

Our Orthopaedic Merino Mattress combines New Zealand merino wool in the comfort system with a 5-zone pocket spring support system. We would not describe any mattress as guaranteed to keep every person cool, but breathable materials and an open spring core are sensible features to compare if temperature matters to you.

Your mattress protector can change how the bed feels

A mattress can be breathable underneath but still feel warmer if it is covered by heavy, non-breathable bedding. Choose a protector that balances waterproof protection with breathability, then use sheets and bedding that suit the season.

If your current protector feels plasticky, noisy or noticeably warm, it may be contributing to the problem.

Do not overlook the bedroom itself

Sleep experts generally recommend a comfortably cool bedroom rather than an overheated one. Closing curtains during hot afternoons, creating cross-ventilation in the evening, using a fan and switching to lighter bedding can make a meaningful difference.

In humid New Zealand conditions, ventilation is particularly important. A dry, well-aired room often feels more comfortable than a closed room even when the temperature is similar.

What should a hot sleeper ask before buying?

Ask what the support core is made from, what materials sit in the comfort layers, whether the mattress contains thick memory foam, what type of protector is recommended and how the retailer describes the surface feel.

Also think about whether you share the bed. Two people create more body heat than one, so a larger bed can sometimes feel more comfortable simply because each person has more personal space and less direct contact.

If overheating is severe, new or accompanied by unexplained night sweats, speak with an appropriate health professional rather than assuming the mattress is the only cause.

Frequently asked questions:

What type of mattress is coolest?

There is no universal winner. Mattresses with good airflow, breathable comfort materials and lighter bedding often feel cooler than dense, heat-retaining setups.

Are pocket springs good for hot sleepers?

Pocket spring cores contain open space between coils, which can support airflow through the mattress. The comfort layers on top still affect temperature.

Is merino wool too hot in summer?

Not necessarily. Merino wool is naturally breathable and helps regulate temperature by managing heat and moisture around the body. Rather than simply adding warmth, it helps create a more balanced sleeping microclimate, keeping you comfortable across changing seasons. The overall feel will still depend on the mattress construction, room temperature and the bedding used on top.

 Can a mattress protector make me hot?

It can. A heavy or poorly breathable protector may change how the bed feels, so look for a breathable protector that still gives the protection you need.

Need help choosing the right bed for the way you sleep? Visit our Hamilton showroom or contact the Luxury Orthopaedic Beds team for practical advice on mattress feel, size, base options and delivery.