CoolSleep Gen2 Mattress Cooler 90x 200cm
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Temperature range
12–48 °C set it yourself, degree by degree
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Only water
Only water in the topper, no electronics in your bed
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Auto shut-off
Switches off by itself, whenever you want
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Dynamic temperature
Dynamic temperature adjusts automatically
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5 sleep programmes
From summer cool to cosy warm
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Energy-efficient
About 1.2 kWh per 8-hour night
Sleeping together, with separate temperature settings, beds ranging from 160 to 180 cm
€ 1.503
You save €167
Sleeping together? Get 10% off when you buy 2 or more sets
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Free delivery NL.BE.DE
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30 days try-out
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Fast shipping
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3-year warranty
Turn your bed into a place to let go of the day
Warmth in bed can make your evening restless. You toss and turn, stick a leg outside the covers, or keep searching for a cool spot.
With CoolSleep Gen2, you set the temperature that suits you right now. Cooler when heat keeps you awake, warmer when you need a little extra warmth.
Cool, even on the warmest nights
Your bedroom stays warm, but your bed cools down. You fall asleep faster and toss and turn less.
Wake up fresh and dry
Your body releases its heat through the mattress. Keep your duvet, and wake up feeling fresh.
Your own temperature, side by side
One set each, one temperature each. No more debates about the window.
A warm bed on cold nights
CoolSleep warms too. Step into a pre-warmed bed, then simply switch it off.
Gen 2: built with your feedback
Gen 1 customers told us what they missed: a timer and a version for two. We improved it, step by step.
Switches off by itself, whenever you want
Use the remote to set a timer from half an hour to 24 hours. Pre-Cool &warm your bed before you get in, cool it until you fall asleep, or keep it on all night until you get up. Then CoolSleep switches off by itself. One less thing to think about.
A temperature that moves with your night
Choose a curve: cooler as you fall asleep, a little warmer towards morning. So you wake up calmly.
More even cooling
Improved water circulation, so the cool feels the same everywhere.
The topper goes in the washing machine
Wash the topper at 30–40 °C. Your bed stays fresh, without the fuss.
Everything at a glance
A new remote with a clear display. The screen dims by itself when you go to sleep.
Choose your sleep programme
Press MODE to choose one of the five programmes. CoolSleep then adjusts the temperature by itself, all night long.
Summer cool
While you sleep
Starts fresh at 14–15 °C, deep sleep at 18 °C
When you wake up
Wake up fresh at 15–16 °C
Best for
People who sweat a lot at night
Pleasantly fresh, without ever feeling cold.
While you sleep: Starts at 21 °C, around midnight 19 °C
When you wake up: Gently warms to 22–23 °C
Best for: Pleasantly fresh without feeling cold, in spring and autumn
Step into a warm bed on cold winter nights.
While you sleep: Starts at 40 °C, around midnight 30–35 °C
When you wake up: Steady at 30 °C
Best for: Cold winter nights, wonderfully relaxing warmth
Keeps your bed steady, even when the night changes.
While you sleep: Starts at 20 °C, then steady at 18–19 °C
When you wake up: Gradually to 20–21 °C
Best for: A night where temperature changes are quietly evened out
A gentle, steady temperature from evening to morning.
While you sleep: Gentle start at 16–18 °C, rises to 19–20 °C
When you wake up: Steady at 21 °C
Best for: A calm night without big temperature swings
Temperatures shown are the water temperature in the system. On your mattress it feels milder.
Set up in about 15 minutes
The unit beside your bed brings water to the temperature you choose.
It flows through thin tubes in the topper, cooling or warming the spot where you lie.
How CoolSleep works in your home
Short videos about what people ask us most.
How CoolSleep works
CoolSleep unit beside your bed circulates water at your chosen temperature through thin channels in the topper
We tested it on a thermal camera
See how CoolSleep brings your bed to the temperature you set.
Hear it for yourself
Recorded in an ordinary bedroom, without editing. About 40 dB(A) at 1 metre: a soft, steady hum.
Set up, timer and programmes
Pick a programme, set the timer, and your bed is just right when you get in.
What sleepers say
Reviews are about CoolSleep Gen1. Gen2 reviews will follow after launch.
Which solution suits your night?
There are several ways to sleep cooler or warmer. Here you can see honestly what each option does and doesn’t do.
| Feature | Fan | Air conditioning | Cooling bedding | Electric blanket | CoolSleep Gen 2 |
|---|---|---|---|---|---|
| Cools | Moves air | The whole room | Slightly, passively | No | Yes, your bed |
| Warms | No | Sometimes | No | Yes | Yes |
| Set the temperature | No | For the room | No | In settings | By the degree |
| Own temperature per person | No | No | No | Sometimes | Yes, per set |
| Adjusts during the night | No | No | No | No | Yes, 5 programmes |
| Sleep with the window open | Yes | No | Yes | Yes | Yes |
| Draught or dry air | Draught | Dry air | No | No | No |
| Use it in | Summer | Mostly summer | Summer | Winter | All year round |
| Energy per night (8 hours) | approx. 0.3 kWh | approx. 4–8 kWh | None | approx. 0.2–0.5 kWh | 1.2 kWh (approx. €0.36) |
Indication based on common devices and €0.30 per kWh. Actual use varies by model and use.
One system all year round
No more switching between summer and winter duvets. Your bed adapts to the season.
Warm, without overheating
In winter you choose how warm. The programme gently eases the warmth during the night.
Window open, bed at the right temperature
Sleep with fresh air in your room while your bed stays at the right temperature.
Safe and efficient
Only water in the topper. 1.2 kWh per night, a fraction of what air conditioning uses.
Fits under your bedside table
The unit is compact and blends quietly into your bedroom.
Under or next to your bedside table
| Size | 90x200cm |
|---|---|
| Temperature range | 12–48 °C |
| Sound | Cooling: about 40 dB(A) at 1 m, Warming: 36–38 dB(A) · professionally measured |
| Energy per night | 1.2 kWh per 8 hours |
| Timer | Set it yourself, from 0.5 to 24 hours |
| Power | 150 W, eco mode uses 20% less |
| Unit | 26 × 22 × 29 cm, |
| Hose length | 2.1 m |
| Power supply | 220–240 V, 50/60 Hz |
| Topper | Mesh side (polyester) and linen side (cotton), machine washable |
| weight | 9.8kg |
| Warranty | 3 years on the technology |
Do this at the end of the season before storing the unit, when you start using it again after a long break, or whenever you want to refresh the water thoroughly.
- Switch CoolSleep off, unplug it and let it cool down if needed.
- Place the unit on a flat, water-resistant surface and keep a clean cloth at hand.
- Mix 180–200 ml of 3% hydrogen peroxide (available at the pharmacy) with 660 ml of distilled water.
- Slowly pour the solution into the tank, without exceeding the maximum of 850 ml. Close the cap.
- Connect CoolSleep, plug it in and let the solution circulate for 30 minutes at 35 °C.
- Switch off, unplug and drain the solution completely. Fill the tank with 850 ml of clean distilled water and let it circulate for 5 minutes at 35 °C.
- Switch off, unplug and drain the rinse water completely using the drain key. Your system is fresh and ready to use.
- Distilled water is best for a long lifespan of the system.
- Using tap water? Add one bottle (10 ml) of CoolSleep Conditioner straight away. It protects the system against algae, bacteria and limescale.
- You don’t need to change the water. Just add 10 ml of CoolSleep Conditioner every six months.
- When the water drop icon on the display flashes, slowly top up the tank until the icon stops flashing.
- Always place the topper in a large laundry bag. This protects the connectors and the water channels inside.
- Wash at 30–40 °C with a mild detergent.
- Spin at a low speed, 600 to 800 rpm at most.
- While the topper is still damp, gently pull it back into shape in length and width.
- Let it air dry, hanging or lying flat. Never use a tumble dryer and do not iron the topper.
- Clean the ventilation openings at least once a month. Do this more often if you have pets, carpet or a lot of dust, or if the unit sounds louder than usual.
- Keep the filling opening and connectors clean, so no dust or fibres get into the water circuit.
- Hear air or a bubbling sound? Leave the cap of the water tank open and let the unit run for 30 minutes. The air escapes through the tank.
CoolSleep fits almost every bed. The topper lies on top of your mattress and is held in place with long straps, so it works on a box spring, a bed with slats, a platform bed or a mattress on the floor.
Available widths
- 80 cm
- 90 cm
- 120 cm
- 140 cm
- 180 cm
Sleeping in a wider bed, or do you and your partner like different temperatures? Choose two CoolSleep sets side by side. Each of you then has your own temperature, and you get 10% off when you buy two or more sets.
Adjustable and electric beds
CoolSleep also works on beds with an adjustable head or foot section, including electric adjustable beds. A few tips for the best result:
- Leave a little slack in the hose, so it can move along when the bed changes position.
- Make sure the hose doesn’t run through the moving parts of the bed frame, where it could get pinched.
- Check now and then that the topper and the hose have no sharp kinks. A kink slows down the water flow and reduces cooling and warming.
- Place the unit where the hose can reach comfortably in every position of the bed. Need more reach? The 3.5 m extension hose gives you extra freedom.
WHY I MAKE COOLSLEEP
“The first time I slept on a cooled topper, I noticed how quickly I relaxed. But the systems on the market were expensive. With twenty years of technical experience, I started building an affordable alternative, step by step. Gen 2 is what I’ve learned from your feedback.”
Marissa Long, founder of KOZ-É · Bemmel, the Netherlands
Frequently asked
questions
Can’t find your question? We’re happy to help you personally.
Email or call us
When cooling, it measures about 40 dB(A) at 1 metre from the front and back,Warming is quieter, at 36–38 dB(A). These values were professionally measured.
Sensitive to sound? Turn the front or back of the unit towards your bed, or place it at the foot of the bed with the 3.5 m extension hose. With the timer, CoolSleep switches off after you’ve fallen asleep. And you have 30 nights to try it at home.
Turn your bed into a place to let go of the day.
Try CoolSleep Gen2 at home for thirty nights. If it doesn’t suit you, send it back free of charge.
30-night trial · 3-year warranty · free delivery NL · BE · DE