A mattress topper can help you sleep cooler, but it won't 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 help you sleep cooler, it's worth finding out exactly what's causing the heat. You can't solve every cause by adding another layer to your mattress.
Your mattress traps heat
Some mattresses - especially thick memory foam mattresses without ventilation channels - absorb body heat and don't release it quickly enough. Your body loses heat at night to stay asleep; if the mattress traps that heat instead of releasing it, your body temperature stays too high.
Synthetic bedding and sleepwear
Polyester sheets, duvet covers, and pajamas are less breathable than cotton or natural fibers. They trap moisture instead of wicking it away, making you feel clammy faster - even if the mattress itself isn't the problem.
Room temperature and ventilation
A bedroom that stays warmer than 18–20°C at night, or a room with no air circulation, makes any heat problem worse. This is often the easiest 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 doctor is a better first step than buying a new topper.
Can a mattress topper really help you sleep cooler?
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 depends on three things: the cover material, the topper's thickness, and the structure of the foam itself.
Memory foam responds to body heat and comfortably conforms to your body - but that same property means it releases heat more slowly than cold foam.
Here, the honest story is a little more nuanced than many product pages let on. 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 works: a breathable cover that wicks away moisture instead of trapping it, and a construction that lets air circulate between your body and the core of the topper.
What to look for in a topper for sleeping hot
A breathable cover
Bamboo and Tencel naturally regulate moisture and feel cooler than polyester. Bamboo fiber absorbs moisture faster and releases it faster too — which noticeably helps with 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 hit the sweet spot: enough thickness for real 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 of comfort and breathability.
Choose your size →Material construction
Open-cell foam — foam with a more open cell structure — allows air to circulate better than dense, closed-cell foams. That's exactly why two toppers with the same material label can still feel very different on a warm night.
Pairing it with a fitted sheet and duvet
Even the best topper is undermined by a synthetic fitted sheet on top. Always pair 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, reduces heat | Medium | Won't fully solve the problem of an extremely warm mattress |
| Mattress protector (mattress pad) | Protects against moisture, keeps the mattress dry | Low | Does little to address the root cause of the heat itself |
| Cooling blanket | Active temperature regulation, immediate effect | Low–medium | Won't solve the problem of a heat-retaining mattress |
| Fan / room temperature | Lowers the ambient temperature | Low | Won'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 your only concern, room ventilation and bedding are cheaper first steps.
When is a topper not the solution?
A mattress topper isn't a miracle cure. In two situations, it's better to try something else:
The Ella Mattress Topper 7 cm: which one is right for you?
Both toppers have a bamboo cover and 7 cm of cold foam. The difference is in the firmness of the core — choose based on how you prefer to lie.
For side sleepers & stomach sleepers
Medium Mattress Topper
- Soft to medium core
- Bamboo cover — wicks away moisture
- Open-cell foam — breathable
- 7 cm · multiple sizes
From €84,95
Choose your size →
For back sleepers & extra support
Firm Mattress Topper
- Firm core — extra support
- Bamboo cover — wicks away moisture
- Open-cell foam — breathable
- 7 cm · multiple sizes
From €84,99
Choose your size →Still unsure, or looking for a slimmer or thicker option? Browse the full range of Ella mattress toppers and compare all the options by thickness, firmness and ventilation.
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 simply retain a little 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’s not a guaranteed solution for sweating. If the cause lies with your mattress or your 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-cell 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 hot with a mattress topper?
Usually, this is 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 moulds comfortably to your body, but it releases heat more slowly than, for example, cold foam. The cover and thickness ultimately determine how much you notice this.