A mattress topper can reduce sleeping hot, but it does not always solve the problem completely. The cover, thickness, and material determine how much heat is retained.
Why do you actually get hot at night?
Before buying a topper to combat sleeping hot, it is useful to know exactly what is causing the heat. Not every cause can be solved with an extra layer on your mattress.
Your mattress retains heat
Some mattresses — especially thick memory foam mattresses without ventilation channels — absorb body heat and do not release it quickly enough. Your body loses heat at night in order to stay asleep; if the mattress retains that heat instead of releasing it, your body temperature remains too high.
Synthetic bedding and nightwear
Polyester fitted sheets, duvet covers, and pajamas are less breathable than cotton or natural fibers. They retain moisture instead of wicking it away, making you feel clammy more quickly — even if the mattress itself is not the problem.
Room temperature and ventilation
A bedroom that stays warmer than 18–20°C at night, or a room without air circulation, makes any heat problem worse. This is often the simplest factor to check before spending money on new bedding.
Physical causes
Hormonal fluctuations, metabolism, and certain medications can cause night sweats that have nothing to do with your mattress. If you regularly wake up drenched, regardless of the season or your bedding, talking to your GP is a better starting point than buying a new topper.
Can a mattress topper really reduce sleeping hot?
Yes — but not automatically. It depends entirely on how the topper is constructed. A mattress topper adds an extra layer between you and your mattress. Whether that layer retains heat or wicks it away is determined by three things: the cover material, the thickness of the topper, and the structure of the foam itself.
Memory foam responds to body heat and comfortably contours to your body — but that same characteristic means it releases heat less quickly than cold foam.
This is where the honest story is a little more nuanced than many product pages would have you believe. A topper made entirely of memory foam with a dense, synthetic cover can actually contribute to sleeping hot — even if it feels wonderfully soft in the store.
What does work: a breathable cover that wicks away moisture instead of trapping it, and a construction that allows air to circulate between your body and the topper's core.
What to look for in a topper for hot sleepers
A breathable cover
Bamboo and Tencel are naturally moisture-regulating and feel cooler than polyester. Bamboo fiber absorbs moisture faster and releases it again more quickly — which noticeably helps combat that clammy feeling in the middle of the night.
Thickness: the sweet spot is 7 cm
A thick 10 cm topper feels luxurious, but a thick layer of foam also retains more heat. At 7 cm, you're in the sweet spot: enough thickness for genuine pressure relief and support, but not so thick that ventilation is compromised.
Recommended for hot sleepers
Ella Mattress Topper — 7 cm
Bamboo cover for moisture wicking. Open-cell cold foam that allows air to circulate. A balance between comfort and breathability.
Choose your size →Material composition
Open-cell foam — foam with a more open cell structure — allows air to circulate better than dense, closed-cell foams. This is exactly why two toppers with the same material label can still feel very different on a warm night.
The combination with the fitted sheet and duvet
Even the best topper is undermined by a synthetic fitted sheet on top. Always combine a breathable topper with cotton or Tencel bedding. The topper and bedding work together, not separately.
Mattress topper vs. other solutions for night sweats
| Solution | What it solves | Investment | What it doesn't solve |
|---|---|---|---|
| Mattress topper (breathable cover) | Improves ventilation and comfort, moderates heat | Medium | Doesn't fully solve an extremely warm mattress |
| Mattress protector (mattress pad) | Protects against moisture, keeps the mattress dry | Low | Does little to address the actual cause of the heat |
| Cooling blanket | Active temperature regulation, immediate effect | Low–medium | Doesn't solve a heat-retaining mattress |
| Fan / room temperature | Lowers the ambient temperature | Low | Doesn't help if the mattress itself is the problem |
| New mattress | Addresses the root of the problem | High | A major investment, not always necessary |
A mattress topper with a bamboo cover is the better choice if you want to improve both comfort and support while also addressing heat. If temperature regulation is truly your only concern, room ventilation and bedding are cheaper first steps.
When is a topper not the solution?
A topper is not a miracle cure. In two situations, you may be better off trying something else:
The Ella 7 cm Mattress Topper: which one is right for you?
Both toppers have a bamboo cover and 7 cm of cold foam. The difference lies in the firmness of the core — choose based on how you prefer to sleep.
For side sleepers & stomach sleepers
Medium Mattress Topper
- Soft to medium core
- Bamboo cover — moisture-wicking
- Open-cell foam — highly breathable
- 7 cm · multiple sizes
From €84,95
Choose your size →
For back sleepers & more support
Firm Mattress Topper
- Firm core — extra support
- Bamboo cover — moisture-wicking
- Open-cell foam — highly breathable
- 7 cm · multiple sizes
From €84,99
Choose your size →
Alternative for sleeping hot
Ella Cooling Blanket
Is heat your biggest — or only — complaint at night? The cooling blanket is specifically designed to actively cool you, rather than merely retaining slightly less heat.
View cooling blanketFrequently asked questions
Does a mattress topper help with sweating?
A topper with a breathable cover and the right thickness can noticeably reduce sleeping hot, but it is not a guaranteed solution for sweating. If the cause lies with your mattress or body, a topper will only help as part of a broader approach.
Which mattress topper is the coolest?
Toppers with a bamboo or Tencel cover and a thinner, open foam structure are the most breathable. Thick memory foam toppers with a synthetic cover are usually the least cooling option.
Why do I wake up feeling hot with a mattress topper?
This is usually caused by a combination of a thick foam layer and a synthetic cover that retains moisture instead of wicking it away. Synthetic bedding on top can also intensify this effect.
Is memory foam warmer than other materials?
Yes, naturally. Memory foam responds to body heat and therefore molds comfortably to your body, but it releases heat less quickly than, for example, cold foam. The cover and thickness ultimately determine how much you notice this.