2,542 five-star sleepers
Sleep cool.
Every single night.
A dual-sided cooling comforter — silky Arctic Silk on one side, breathable CloudKnit on the other. Lightweight Naia™ fill wicks heat away, so you wake up dry, not drenched.
Find your cool
Not just a comforter.
It's the upgrade.
Three reasons hot sleepers refuse to go back to a regular comforter.
Flip for your perfect coolTwo cool sides. One comforter.
Flip to the silky Arctic Silk side for an instant cool-to-the-touch hit, or the breathable CloudKnit side for soft, airy cool. One comforter, two ways to chase the cold spot — without ever leaving the bed.
Built for hot sleepersWake up dry, not drenched.
Air channels in the lightweight Naia™ fill let body heat escape while the cool-touch shell wicks away moisture. No more 3am heat traps or sweating through the night — just balanced, breathable comfort.
Lightweight, year-roundPlush and full — never hot & heavy.
Airy Naia™ fibers feel rich and full like a real comforter, but stay light and breathable instead of trapping heat. Eco-friendly, biodegradable, and OEKO-TEX® certified gentle on sensitive skin.
Why hot sleepers are switching to mellow
Real people, sleeping better
sleep at their ideal temperature
would recommend mellow to family & friends
left a 5-star review
Comes in three calm shades
White, Light Grey and Lavender — pick the one that matches your bed.
Loved by 2,542 hot sleepers
4.9 out of 5 · verified reviews
I stopped waking up sweaty
"I sleep so hot I used to kick the duvet off by 2am. This one actually stays cool — the silky side is unreal. First summer I've slept through the night."
✓ Verified Buyer
We each pick a side
"My partner runs cold, I run hot. The dual sides mean we both win. Light but still feels full and cozy."
✓ Verified Buyer
Cool without being thin
"Most cooling blankets feel like paper. This one is genuinely plush AND cool. Best of both."
✓ Verified Buyer
The lavender is gorgeous
"Looks beautiful on the bed and feels even better. Ordered a second in grey for the guest room."
✓ Verified Buyer
Finally, no night sweats
"Menopause + a hot bedroom was brutal. This comforter changed my nights. Wake up dry now. Thank you."
✓ Verified Buyer
Washes like a dream
"Threw it in the machine, came out perfect. Lightweight, breathable, and so soft. Worth every cent."
✓ Verified Buyer
Sleep on it worry-free
Does it actually keep me cool?
Yes. It's dual-sided — a silky Arctic Silk side for instant cool-to-the-touch, and a breathable CloudKnit side for soft, airy cool. The lightweight Naia™ fill has air channels that let heat escape and wick away moisture, so you stay dry instead of sweaty.
What's the difference between the two sides?
Flip it to your feel. Arctic Silk is smooth and cold to the touch — perfect for hot nights. CloudKnit is a little plusher and breathable — great for milder nights. Same comforter, two experiences.
Is it warm enough for winter too?
Yes — it's a true year-round comforter. The airy fill insulates without trapping heat, so it works with AC in summer and stays cozy in winter. Light, but full.
Which size should I order?
Match it to your mattress — Twin, Twin XL, Full, Queen, King or Cali King. If you like extra drape or share the bed, sizing up one is a popular choice.
Can I machine wash it?
Absolutely. Machine wash cold, tumble dry low. It comes out fresh and keeps its loft — no dry cleaning needed.
What if I don't love it?
You get a 30-night sleep trial. Sleep under it for a month — if it's not the coolest, comfiest comforter you've owned, send it back for a full refund, no questions asked.
Your coolest night's sleep is
one click away. Try mellow.
Join 2,542 hot sleepers who finally stopped waking up sweaty. Cool, light, breathable.
Shop the CloudCool Comforter30-night trial · Free shipping · Machine washable