The Complete Guide to Cooling Blankets: How They Work and Whether You Need One
A cooling blanket keeps you cooler by moving heat and sweat away from your skin faster than an ordinary blanket. It does this in one or more of three ways: yarns that draw heat out of your skin on contact (so they feel cold), fabric that wicks sweat and lets it evaporate, and phase-change fill that absorbs heat when you get warm and releases it when you cool down. A passive cooling blanket can't make you colder than the room. To use one, put the cool side against your body, keep it as your top layer, and don't pile a duvet on top of it.
How cooling blankets work
Conduction: why the fabric feels cold
Your skin is usually warmer than your bedding. When you touch a fabric that conducts heat well, heat leaves your skin quickly and your nerves read that as cold. Many cool-touch blankets use nylon or polyethylene yarns woven tight and smooth for exactly this reason. Some brands list a Q-max figure, which measures how fast a fabric pulls heat from skin on first contact; a higher number feels colder.
The catch is that the cold feeling fades once the patch of fabric under you warms to skin temperature. Rolling onto a fresh section brings it back for a while.
Moisture wicking and airflow
Sweat only cools you when it evaporates. Fibers such as TENCEL lyocell, bamboo viscose and cotton percale absorb moisture and let it move off your skin, and open or breathable weaves let warm, damp air escape. A dense polyester comforter does the opposite: it holds humid air against you, which is why you wake up clammy rather than just warm.
Phase-change materials
This is the answer to anyone searching for a blanket that regulates body temperature. Phase-change materials (PCMs) melt and solidify at temperatures close to skin temperature. Melting soaks up heat without the material getting warmer, so when you heat up, the fill absorbs the extra. When you cool down, it solidifies and gives that heat back. The effect is a buffer that smooths out the swings between too hot and too cold.
PCM fill has limited capacity. Once it has absorbed all it can, it stops pulling heat until it has a chance to release it, so in a very hot room it helps less.
Active systems
Products like Chilisleep, Eight Sleep and BedJet move water or air with a powered unit, and these can cool you below room temperature. They are mostly mattress pads or under-sheet systems rather than blankets, and they need power, a control unit and more money. Most products sold as "cooling blankets" are passive.
| Type | How it cools | Best for | Trade-off |
|---|---|---|---|
| Cool-touch synthetic (nylon, polyethylene) | Conduction | People who want an instant cold feel | Feeling fades as it warms; can feel slick |
| Natural or regenerated fiber (lyocell, bamboo, percale) | Wicking and breathability | Sweaty sleepers, humid climates | Less dramatic cold feel at first touch |
| Waffle or open weave cotton | Airflow | Hot rooms, summer | Very little warmth on cool nights |
| Phase-change fill | Absorbs and releases heat | People who swing between hot and cold | Finite capacity in a hot room |
| Active water or air systems | Powered cooling | Very hot sleepers with budget for it | Cost, noise, setup |
Which side of a cooling blanket goes up?
On most single-sided cooling blankets, the cool side goes down against your body and the softer side faces up. The cooling face is usually smooth, a little slippery and sometimes slightly shiny. The other face is often cotton: matte, softer, and warmer to the touch.
If you can't tell, press your palm flat on each side for a few seconds. The side that feels colder goes against your skin. Putting the cooling face up wastes it, since it would be touching air instead of you.
Reversible blankets are designed to be flipped: cool side down on warm nights, warmer side down when the weather turns. If both faces are the same fabric, it doesn't matter which way up it goes. Check the care tag too, because some brands mark the cooling face.
How to use a cooling blanket
- Make it your top layer. A cooling blanket tucked under a heavy duvet turns back into a warm bed, because the duvet traps the heat the blanket is supposed to release.
- Let it touch you. Cool-touch blankets work by contact, so they do the most directly on skin or over thin sleepwear. A light, breathable top sheet is fine if you prefer one.
- Look at what's underneath. Half of your body heat goes into the mattress, and a heat-trapping mattress or a plastic-backed waterproof protector can undo what the blanket does on top.
- Keep the room cool. Many people sleep best somewhere around 60 to 67°F, and a fan helps sweat evaporate.
- Move when your spot warms up. Shifting to a fresh area of the blanket, or sticking a foot out, restores the cool feel.
- Skip the freezer. Chilling a blanket gives you a few minutes of cold at most and can leave it damp with condensation.
- Wash it gently. Cold or warm water, mild detergent, low heat or line drying, and no fabric softener, which coats fibers and can reduce both wicking and the cool feel. Follow the label on your blanket.
The Dosaze cooling comforter
If you searched for the Dosaze cooling blanket or cooling comforter, that is the Dosaze ThermaCool Comforter. It combines two of the methods above. The fill is 30% phase-change micro-gel, which absorbs excess heat and releases it as you cool down (the approach is inspired by NASA's original temperature-regulating research). The fabric uses TENCEL lyocell fibers for breathability, and it is cool to the touch, moisture-wicking and hypoallergenic.
It has a dual-sided design for year-round use, so you can flip it as the seasons change. Use the face that feels cooler against you in summer.
Because it is a comforter, it has more body than a thin cool-touch throw while staying lightweight and airy. That suits people who like the feel of a real comforter but run warm, or who wake up hot at 2 a.m. and cold at 5. If what you want is the sharp, icy first touch of a thin nylon throw, the ThermaCool will feel milder. And if your bedroom stays very hot all night, no passive comforter will fix that alone.
Cooling the rest of the bed
A cool comforter on top of a hot bed only solves half the problem. The Dosaze ThermaCool Sheet Set is temperature regulating, moisture-wicking and cool to the touch, and its fibers have submicroscopic channels that absorb and then release moisture. Under the sheets, the Cooling Bamboo Waterproof Mattress Protector uses bamboo fabric designed to keep you cool and sweat-free while still blocking liquids. For your face and neck, the ThermaCool Pillow Case is cool to the touch and temperature regulating.
You can see these alongside the rest of our pillowcases, protectors and comforters in the Dosaze bedding collection.
Frequently asked questions
Do cooling blankets actually work?
They work within limits. A cooling blanket moves heat and moisture away from your skin faster than a regular blanket, so you feel cooler and less sweaty, but a passive blanket can't cool you below the temperature of your room. Pairing one with breathable sheets and a cool bedroom gives the best result.
Can you use a cooling blanket in winter?
Yes, especially if you sleep hot or share a bed with someone who likes it warm. Reversible or dual-sided blankets let you flip the warmer face toward you on cold nights. Phase-change fill also releases stored heat as you cool down, which helps in cooler weather.
Should you put a sheet between you and a cooling blanket?
You can, but a thick sheet blunts the effect, particularly with cool-touch blankets that work by direct contact. If you want a top sheet, choose a thin, breathable one such as lyocell, bamboo or cotton percale.
Are cooling blankets good for night sweats?
A breathable, moisture-wicking blanket can make night sweats more comfortable by letting sweat evaporate instead of trapping it. It won't treat the cause, so if night sweats are new or frequent, talk to a doctor.
How do you wash a cooling blanket?
Use cold or warm water with a mild detergent and dry on low heat or on a line. Skip fabric softener, because it coats fibers and can reduce wicking and the cool feel. Always check the care label first.
