How we test products
Our mission is to take the guesswork out of finding the perfect sleep products.
We've dedicated hundreds of hours to testing mattresses and sleep accessories, and rely on a team of testers of differing weights, temperature preferences, and sleeping positions to evaluate each product.
Tested products are granted the Sleep Hero tested stamp of approval, a mark of our review's reliability.
If we haven't personally tested a product, please be assured that we invest significant time and energy into scouring the UK market and researching the best recommendations, and we work with a team of sleep experts who review our articles, ensuring that the insights we provide are not only relatable but also reliable.
What is a cooling mattress?
A mattress that is cooling includes natural ventilation or temperature regulating technology. 🌡️
This means your body heat can circulate out of the mattress or be absorbed into the cooling material.
The best cool mattress for your sleep depends on the material.
Below, we will examine a variety of these materials in detail.
Gel mattresses are some of the coolest mattresses available.
They have a foam-like feel, which makes them ideal for hot sleepers who like the feeling of memory foam. ☁️
The foam material contains tiny gel crystals that absorb body heat when you get too hot.
Likewise, if you feel too cold, the gel crystals will release the stored body heat to keep you at the perfect body temperature.
The iGel Advance 3000i Plush Top mattress is our favourite gel mattress made with advanced graphene technology.
Latex mattresses are natural and one of the most eco-friendly mattress materials available. ♻️
This is because latex is a sap collected from rubber trees that doesn’t harm forests or wildlife when harvested. 🌴
Latex mattresses are also highly durable (lasting anywhere as long as 15 years) and biodegradable at the end of their lifecycle.
Latex is manufactured with tiny pinholes that promote ventilation.
This creates a “pump and suck” effect.
As you move around in your sleep, heat will be pushed away from your body and into these little gaps in the mattress, keeping you cool.
Our favourite choice, the Dunlopillo Royal Sovereign mattress, is made from 100% pure latex.
Traditional pocket-sprung mattresses provide excellent breathability during sleep.
Unlike other mattress materials, heat flows out easily between the springs. 🌬️
Pocket springs also provide fantastic support across the body.
Each spring is contained in a fabric pocket that supports each individual area.
Pocket springs minimise motion transfer, making them an excellent choice for couples and restless sleepers. 💑
The Silentnight Pocket 2000 Latex mattress offers lots of support while keeping you cool at night.
Natural materials in mattresses and bedding are well known for maintaining a cooler sleep environment. 🌱
Some mattresses use natural fillings like wool or cotton, while other brands utilise a bamboo, Tencel or cotton cover for optimal breathability.
Wool has excellent temperature-regulating properties to keep you warm in cold temperatures and cool during warmer periods.
Bamboo is another great natural choice for its moisture-wicking capabilities.
Its naturally hypoallergenic and anti-bacterial properties contribute to a clean, dry and refreshing sleep environment. 🧼
Bamboo is exceptionally absorbent, capable of wicking away sweat and moisture from the body.
The Simba Hybrid Luxe mattress has a breathable bamboo wool layer for optimal temperature and moisture control. 💦
What about memory foam?
There is much debate when it comes to memory foam.
Typically, memory foam creates a warmer sleep because of its closed-cell structure that retains heat inside the mattress.
However, the best cooling memory foam mattresses are made with additional cooling technology.
The Simbatex Foam mattress is an excellent choice, made with temperature-regulating graphite-infused foam for a cooler sleep.
However, memory foam is incomparable to other cooling materials like traditional spring mattresses or latex.
If you're a hot sleeper, we'd recommend avoiding memory foam altogether.
Do cool sleep accessories work?
Buying a new mattress is a big investment. 💰
So it’s understandable that you might want to try some alternative options first.
Like mattresses, cooling accessories, such as cooling pillows, sheets, and mattress pads, are designed to regulate the body's temperature during sleep.
We'll unpack more about the cooling properties of these accessories below.
Cooling mattress toppers
A cooling mattress topper contains similar materials to a cooling mattress.
The cooling technology draws heat away from the body or promotes a natural airflow system. 🌬️
A cooling mattress topper is also a great idea for those looking to enhance the comfort of their mattress.
For example, if your mattress is too firm, a cooling mattress topper can add some extra softness while keeping you cool.
The Simba topper is made with cooling Simbatex foam and breathable Aerocoil springs.
Likewise, if you find yourself flipping to the cold side of the pillow all night, then consider a cool pillow. 🤔
Cool pillows are made with breathable fibres or advanced cooling materials that help the head stay cool. 🥶
Some cool pillows have gel inserts or attached cooling pads that stay cold all night.
The Kally Cooling pillow is made with advanced air vent technology to dissipate excess heat during sleep.
Cooling mattress pads
A cooling mattress pad is essential for a hot sleeper or those who suffer from hot flashes. 🥵
If your mattress feels warm but is otherwise comfortable, consider a cooling mattress pad before looking for a replacement.
A cooling mattress pad sits on top of the mattress and has cool gel technology that absorbs excess heat.
Some cooling mattress pads can even be popped into the fridge/freezer for additional coolness. 🧊
The FFTT Pro Cooling mattress pad is made from temperature-regulating gel technology.
Alternatively, for more advanced options, you could consider a cooling cover like the Pod cover by Eight Sleep.
It fits over the mattress like a fitted sheet and is attached to an advanced temperature control device so that you can cool or warm up your mattress before you hop into bed. ❄️
Duvets play an indispensable role in temperature regulation during sleep.
About 80% of the overall temperature in bed is determined by the duvet. If you overheat or freeze in bed, you should reconsider your choice of duvet. Depending on which duvet you use, it may not be suitable for your new mattress.
A duvet's temperature control capabilities largely depend on its materials and construction.
Duvets filled with natural materials like down feathers, bamboo or silk tend to have excellent breathability.
Moreover, duvets with a higher tog rating are thicker and more insulated, suitable for colder nights.
duvets with a lower tog rating are lighter and better suited for warmer seasons or for those who naturally generate more heat when they sleep.
Our favourite cool duvet options:
How much do cool mattresses cost?
Cool mattress prices vary depending on the quality and type of material.
Pocket spring mattresses are usually available in both budget-friendly and high-end options - although the more springs, the more your mattress will cost!
Additionally, you can get cheaper cooling mattresses in memory foam and gel, but the quality determines how well the mattress will regulate heat. ♨️
Latex mattresses are often the most expensive. 💵
Yet, they are also the most durable and should last between 15 - 20 years.
If you’re interested in latex, you could also opt for a hybrid latex mattress, a cheaper and highly breathable alternative.
The Pocket Latex 2000 mattress by Silentnight is a great value alternative.
Cool mattress discount codes
Are you on the hunt for a cool mattress discount code?
Don’t sweat it.
There are plenty of discounts to make your cool mattress more affordable. 🏷️
Bookmark our discounts page for all the best current offers on cooling mattresses, cool mattress toppers, and sleep accessories.
You can also sign up for our newsletter for tailor-made discounts and recommendations.
So, what is the best mattress for hot sleepers?
If you’ve tried every avenue to prevent yourself from overheating at night, it may be time to invest in a new mattress. ✨
The best mattress for staying cool will include temperature-regulating properties like gel or natural materials with pocket springs for optimal breathability.
Pair your cool mattress with natural sheets and a cool pillow for the ultimate cooling comfort. 😍
We highly recommend buying a mattress with a long trial period, so you can be sure it can be tested during a heatwave.