The cooling blanket market is full of products that look similar, make similar claims, and perform completely differently. Most disappointing cooling blanket experiences come down to one thing — buying the wrong material. Here is how to choose correctly.
Start With Material
Material determines everything. No other variable matters if the material is wrong.
Nylon cooling fiber — the best performing material. High thermal conductivity, excellent moisture wicking, maintains performance over time. Look for 100% nylon on both sides.
Bamboo viscose — breathable and moisture wicking but lower thermal conductivity than nylon. Works for mild hot sleepers. Underperforms for significant overheating or night sweats.
Polyester — avoid. Low thermal conductivity despite marketing claims. Feels cool for minutes then performs like a regular blanket.
Cotton — breathable but holds moisture. Better than polyester but not a true cooling blanket material.
Check the Q-Max Score
Q-Max is the standardised scientific measure of contact cooling — how quickly heat transfers from skin to fabric. Anything above 0.35 delivers genuine cooling. Below that you are essentially buying a thin regular blanket.
Good cooling blankets will display their Q-Max score. If a blanket does not list it that is usually a sign the score is not worth advertising.
Both Sides Must Be Cooling
You move during sleep. A blanket that is only cooling on one side means you regularly end up on the wrong side — exactly when you need it most. Both sides should be identical cooling fiber.
Size
Go one size up from your bed size. A larger blanket gives you more surface area and more cool contact points as you move. A queen blanket on a twin bed is better than a twin blanket that does not fully cover you.
Weight and Fill
Lightweight hollow fiber fill is best for hot sleepers. It allows heat to escape rather than accumulate. Heavy fills add to the thermal load your body is trying to shed — counterproductive for anyone who overheats.
Washability
Machine washable is non-negotiable. You will be washing this regularly. Cold wash only — hot water and dryer heat permanently damage cooling fibers. Air dry every time.
What to Avoid
Any blanket that does not specify its Q-Max score. Any blanket made primarily from polyester. Any blanket with only one cooling side. Any blanket marketed as both cooling and warming — the two properties are contradictory by design.
The Bottom Line
Buy nylon. Check the Q-Max. Make sure both sides cool. Everything else is secondary. The Stillwell Cloud meets all criteria — 100% nylon, Q-Max 0.40, both sides cooling, lightweight, machine washable. See The Cloud →