Cooling Sheets Compared: Which Fabric Actually Keeps You Cool at Night?
The coolest sheets are linen and percale-weave cotton if you want air moving through the fabric, and Tencel lyocell or bamboo viscose if your main problem is sweat. Cooling sheets are sheets whose fiber and weave let body heat and moisture escape instead of holding them against your skin. If you sleep hot, avoid standard microfiber, flannel and dense, high-thread-count cotton sateen. Dosaze makes two sets for warm sleepers: the moisture-wicking ThermaCool Sheet Set and the silkier Luxe Bamboo Sheet Set. Both are covered below.
What are cooling sheets?
"Cooling" has no regulated definition, so any sheet can carry the word. In practice a sheet keeps you cooler in two ways:
- Breathability. Air passes through the weave, so the warm layer next to your body can escape.
- Moisture management. The fibers pull sweat off your skin and let it evaporate, so you aren't lying in damp fabric.
Some fabrics are good at one and average at the other. Percale cotton breathes well but moves moisture more slowly than lyocell. Bamboo viscose wicks well, yet a tight bamboo sateen lets less air through than loose linen. There is also the cool-to-the-touch feeling when you first get in, which is pleasant but is the effect most likely to fade once your body heat builds.
Which sheet material is the coolest?
| Fabric | How it keeps you cool | Feel | Main drawback |
|---|---|---|---|
| Linen | Airflow plus high moisture absorption | Textured, relaxed | Wrinkles, costs more, coarse when new |
| Percale cotton | Airflow | Crisp, matte | Absorbs sweat rather than wicking it |
| Tencel (lyocell) | Absorbs and releases moisture | Smooth, drapey | Needs gentle washing |
| Bamboo viscose | Moisture wicking | Soft, slight sheen | Quality varies a lot by maker |
| Cotton sateen | Limited | Silky, heavier | Denser weave holds more heat |
| Polyester microfiber | Very little | Soft, smooth | Traps heat |
Linen
Linen comes from flax. Its hollow fibers and loose weave are why it is usually rated the most breathable sheet fabric, and it absorbs a lot of moisture before it starts to feel damp, then dries quickly. That makes it a strong pick for humid rooms without air conditioning. The downsides are practical: heavy wrinkling, a higher price than most cotton, and a coarse feel when new that softens over months of washing rather than a couple of nights.
Percale cotton
Percale is a weave, not a fiber: one thread over, one under. The result is a matte, crisp sheet (similar to a cotton dress shirt) with steady airflow all night. Long-staple cotton such as Egyptian or Supima makes a smoother, longer-lasting percale. It wrinkles, and heavy night sweaters may find it turns clammy where linen or lyocell wouldn't.
Tencel and other lyocell
Tencel is a brand of lyocell, made from wood pulp (often eucalyptus) in a closed-loop process that recycles its water and solvents. Most "eucalyptus sheets" are lyocell too. The fiber absorbs moisture and releases it again, so the air under the covers stays drier. Expect a smooth, drapey hand rather than crispness, and a price usually above percale.
Bamboo
Most bamboo sheets are bamboo viscose, also sold as bamboo rayon. A smaller number are bamboo lyocell, made with a cleaner process like Tencel's. Bamboo fabric is soft and wicks moisture well. But quality varies more than with any other fabric here: cheaply made bamboo can pill and lose its softness after a handful of washes, so check construction and certifications, not just the label.
Fabrics that run warm
Microfiber is cheap and soft, but its tight synthetic weave holds heat, and flannel is made to trap warmth. Cotton sateen feels silky and is denser than percale. Phase-change and "performance" synthetics feel cold when you lie down; whether that lasts through the night is less reliable than with natural fibers. If you run only slightly warm and want a smooth sheet, a lightweight sateen in the 300 to 400 thread count range is a reasonable middle ground.
Weave, thread count and weight
For cooling, a higher thread count is usually worse. Counts above about 600 are often reached by twisting thin multi-ply yarns together, which makes a heavier, denser cloth. For cotton, aim for 200 to 400 in a percale weave. A 300-count percale will normally sleep cooler than a 600-count sateen.
For bamboo, lyocell and linen, thread count tells you less. Fabric weight in GSM (grams per square meter) is more useful: lighter fabric lets more air through, heavier fabric drapes better. Certifications don't make a sheet cooler, but OEKO-TEX Standard 100 (tested for harmful substances), GOTS (organic fiber) and FSC (responsibly sourced wood pulp, relevant to lyocell and bamboo) tell you what you're buying.
Dosaze cooling sheets: ThermaCool and Luxe Bamboo
Both sets are in the Dosaze sheets collection, and they suit slightly different sleepers.
ThermaCool Sheet Set
ThermaCool is built around moisture. Its fibers contain submicroscopic channels that absorb moisture and then release it, and the fabric is designed to regulate temperature and feel cool to the touch. The fibers are naturally hypoallergenic and engineered to reduce bacteria growth without chemical additives, which helps if you sweat and want sheets to stay fresh. The fabric resists stains and pilling. It also resists wrinkling, so it won't look like slept-in linen, and it gets softer with every wash. Each set has a flat sheet, a fitted sheet and two pillowcases. If you wake up damp, start here.
Luxe Bamboo Sheet Set
The Luxe Bamboo set is 100% bamboo viscose in a single-pick sateen weave, where each yarn is woven individually rather than bundled. At 145 GSM it is denser than many bamboo sheets, heavy enough to drape and light enough to sleep cool. A silver-based Silvadur finish reduces odor-causing bacteria between washes. It comes with a 60-night sleep trial, a 3-year warranty and free US and Canada shipping (see our FAQ page for trial details).
The trade-off is the weave. Sateen is closer than percale or linen, so if you sleep very hot and care most about airflow, ThermaCool or a linen or percale sheet may suit you better. If you want a silky sheet that wicks moisture and holds up without the pilling cheap bamboo is known for, choose this one.
Matching the sheet to how you sleep
- Waking up sweaty points to moisture handling: lyocell, linen, a well-made bamboo, or ThermaCool.
- If you run hot but stay mostly dry, percale cotton gives steady airflow for less than linen.
- In a humid room with little air conditioning, linen or percale tends to hold up best through the night.
- Sensitive skin usually does better on smooth lyocell or quality bamboo than on rough weaves or cheap synthetics.
- Couples where one person runs hot often settle on lyocell or bamboo, which feel less cold than crisp percale or linen.
When sheets aren't the whole problem
Your body temperature drops as you fall asleep, and anything that traps heat works against that. A sheet is a thin layer, though. Under a heavy duvet plus a fleece blanket it has little chance, and a lighter comforter may change more than new sheets would.
Dense memory foam tends to hold body heat, while open-cell foam, latex and coil hybrids let more air move. A waterproof protector that isn't designed to breathe can block airflow too. If you've already switched to breathable sheets and still overheat, look at what's underneath; our mattress collection is one place to start. And if night sweats come from hormonal changes or medication, moisture-wicking sheets can make nights more comfortable but won't change the cause.
Fit and care
A fitted sheet that pops off the corners bunches under you and holds heat. Measure your mattress depth, add the height of any topper, and look for elastic around the whole edge.
Wash in cool or warm water, then tumble dry on low or line dry; high heat wears down natural and lyocell fibers. Skip fabric softener and dryer sheets, which coat fibers and reduce how well they absorb and wick. Linen and percale take a few washes to feel their best, so judge a new set after a couple of weeks.
Frequently asked questions
Are bamboo sheets cooler than cotton?
Bamboo viscose wicks sweat better than cotton, so it often feels cooler to people who sweat at night. A good percale cotton breathes as well or better and tends to last longer. Choose bamboo for a silky feel and moisture handling, percale for a crisp feel and airflow.
Is a lower thread count cooler?
Usually, yes. Very high thread counts, above about 600, are often made with thin multi-ply yarns that create a dense, warmer fabric. For cotton, 200 to 400 in a percale weave is the range to look for.
Are linen sheets cooler than cotton sheets?
For most hot sleepers, yes. Linen's loose weave and hollow fibers let more air through, and it holds more moisture before feeling damp. It is more textured and wrinkles more than percale cotton, so if you only sleep warm now and then, percale may be enough.
Do cooling sheets help with night sweats?
Moisture-wicking fabrics such as lyocell, linen and bamboo pull sweat off your skin so it can evaporate, which makes night sweats less uncomfortable. They don't address the cause, whether that is hormones, medication or a warm room. A lighter top layer and a breathable mattress help as well.
What sheets should hot sleepers avoid?
Standard polyester microfiber and flannel both hold heat. Heavy, high-thread-count cotton sateen is denser than percale and sleeps warmer. Sheets that only feel cold on first contact may warm up once your body heat builds.
