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Finally Sleep Cool
Through the Night
The CloudCool™ Comforter's wood-pulp fill releases your body heat all night, instead of quitting after ten minutes like other "cooling" comforters.
"I'm in love. It keeps us both cool in the 90 degree heat, it makes me want to go to bed early." — Amanda R.
AS SEEN IN
Made From Wood Pulp
Naia™ certified
Stays Cool All Night
Releases heat instead of trapping it
Award Winning
Innovation in Sleep Award
Rated 5 Stars
By 99% of customers
Inside Is CloudCool™ Cooling Technology
The fill is Naia™, a soft fiber made from wood pulp. Wood-pulp fibers breathe in a way plastic-based fills can't: air moves through them all night, carrying your body heat and moisture out instead of letting it build up under the blanket. That's the difference between a comforter that feels cool for ten minutes and one that keeps you cool until morning.
You'll Feel The Difference On Night One
Climb in, and the silky side feels cool the second you touch it. Stay in, and CloudCool keeps the heat from building up. You sleep through the night and wake up dry.
YOU'LL NEVER GO BACK!
Where Science & Comfort Meet
Most "cooling" comforters are ordinary synthetic blankets with a cold-feeling coating. They feel icy for the first ten minutes, then the coating warms up against your body and the blanket spends the rest of the night trapping your heat. That's why you've been let down before.
Here's the thing: your body has to cool down to fall asleep, and stay cool to stay asleep. Any comforter that holds your heat in is working against you all night.
The Mellow Cooling Comforter works differently. One side is silky and cool the instant your skin touches it, for immediate relief when you climb in already hot. And underneath, the breathable Naia™ wood-pulp fill keeps air moving so heat and moisture escape hour after hour, not just at first touch.
The result is one comforter that cools you twice: instantly when you get in, and continuously while you sleep. If you've sworn off "cooling" products that quit after ten minutes, this is the one that changes your mind.
LIGHT ON HEAT
Light Enough That It Never Weighs You Down
A thick, heavy comforter is exactly what cooks a hot sleeper. This one is light, so it never smothers you. It still drapes and feels like a real comforter, not a thin summer sheet.
And it stays that way. The fill washes evenly and fluffs back up in the dryer, so it keeps its loft instead of going flat or lumpy.
TWO COMFORTERS IN ONE
Pick Your Side, Every Night
Both sides keep you cool. The silky side is cool the instant your skin touches it, for nights you climb in already running hot. Flip it over and the knit side feels like your favorite soft t-shirt: gentle, breathable, cozy without the heat.
Sized to fit: Twin/Twin XL 68"×90" · Full/Queen 90"×90" · King/Cali King 90"×106"
COOL ISN'T JUST COMFORT
Sleep Through The Night, Wake Up With Energy
Your body has to cool down to fall asleep and stay asleep. CloudCool™ Cooling Technology helps it do exactly that, all night. And staying cool doesn't just feel good. It helps relieve the problems that come with sleeping hot:
Waking up drenched from night sweats
The 3am wake-up to kick off the covers
Tossing and turning to find a cool spot
Dragging through the next day exhausted
Sweat-soaked sheets and pillowcases
The Mellow Cooling Comforter leaves you feeling better after a night of sleep, not worse.
PREMIUM MATERIALS
Certified Safe, Gentle Enough For A Baby's Skin
The fiber inside is Naia™, made from sustainably sourced wood pulp. It's independently tested and OEKO-TEX® certified, which means it's proven safe from hundreds of harmful substances and gentle enough for long-term contact with sensitive skin.
It's hypoallergenic, 100% vegan with no feathers or animal products, and the whole comforter goes straight in the washing machine. No duvet cover, no dry cleaning, no special care.
What A Cooling Comforter Should Do
Lets your heat escape
Mellow
Others
Lets your heat escape
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Cool all night, not just 10 minutes
✓
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Two cool sides to flip
✓
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Light & breathable but cozy
✓
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Wood-pulp fiber, OEKO-TEX® certified
✓
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Machine washable
✓
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Over 99% 5-star reviews
✓
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Award-winning
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Made For Every Kind Of Hot Sleeper
Menopausal sleepers
When a hot flash hits, flip to the icy side. When it passes, flip back to the cozy side.
Fan-dependant sleepers
No more fan blasting all night, your partner will wish you got a CloudCool™ comforter earlier!
The "been-burned" sleeper
Unlike the "cooling" comforters collecting dust in your closet, this one actually stays cool all night.
99% Of Customers Give It 5 Stars
Out of more than 2,000 reviews. If you've tried other cooling comforters and been let down every time, this is the one.
WHY WE BUILT IT
A Bedding Company That Took Hot Sleepers Seriously
Bedding is what we do at Mellow. And the most common thing we heard from sleepers was the same story: every "cooling" blanket they tried felt cold in the store and hot by midnight.
So instead of adding a cold coating to an ordinary blanket, we rebuilt the inside. We chose Naia™, a breathable fiber made from wood pulp, because it moves heat and moisture out all night instead of trapping it. Then we gave it two cool sides, kept it light, and made the whole thing machine washable.
That comforter went on to win the Innovation in Sleep Award at the SleepTech Summit, and more importantly, 99% of the people who sleep under it give it five stars.
Your Satisfaction Is Our Priority
Try it risk free. If you don't love it, we'll fix it.
30-Night Trial
Sleep on it. Not for you? Send it back.
Lifetime Warranty
Backed for the life of the comforter.
Responsibly Made
Wood-pulp fiber, sustainably sourced.
Quality Promise
Every step controlled for quality.
Real Human Support
Real people, quick to help.
Free Shipping
On all orders over $120.
"I ordered from three different brands that all claimed to have the ‘best’ cooling comforter. The moment I unboxed them, Mellow stood out right away. The quality was obvious. After just a few nights of sleep, there was no question in my mind. This one’s the winner."
Emily K.
Verified Customer
Savings based on comparable value.
Learn more
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Size Guide
Voted #1 Cooling Comforter
Dual Layer - Arctic Silk Side + CloudKnit Side
OEKO-TEX® Certified & Naia™ Sustainable Filling
Hypoallergenic, Antibacterial & 100% Vegan
Fully Machine Washable
Our dual-sided comforter delivers instant cool-to-the-touch relief with a silk-smooth finish on one side, and breathable, cloud-soft knit on the other. Designed to regulate temperature and wick away heat, it keeps you balanced and comfortable all night long.
30-day trial
hassle-free returns
Overview
Meet the Mellow Cooling Comforter, our lightweight, dual-sided design for hot sleepers. Flip between silky-cool Arctic Silk and soft, breathable CloudKnit to dial in your chill. It delivers a plush, full loft without the heat, with a no-duvet-cover, machine-washable shell and Naia™ sustainable fill that keeps air flowing all night. OEKO-TEX® certified, hypoallergenic, antibacterial, and 100% vegan for clean, effortless sleep.
Materials
OEKO-TEX® Certified: Hypoallergenic, safe for sensitive skin, and responsibly made with ethical and eco-friendly processes.
Naia™ Sustainable Filling: Silky-smooth, breathable, and biodegradable, made from sustainably sourced materials for comfort you can feel good about.
FAQ
Will it keep me cool all night?
Yes. The dual-sided design lets you choose Arctic Silk for an instant cool handfeel or CloudKnit for soft, breathable cool. Airflow through the Naia™ fill helps heat escape so you stay comfortable till morning.
How is this different from other “cooling” comforters?
Most use one fabric and call it a day. Mellow gives you two cooling faces, a built-in shell (no duvet cover), machine-washable construction, and a sustainable Naia™ fill so it’s cooler, cleaner, and easier to live with.
Is it actually cool-to-the-touch or just “breathable”?
Arctic Silk feels noticeably cool on contact; CloudKnit feels like a premium, t-shirt-soft cool. Flip to the sensation you prefer.
Lightweight means thin. Will it still feel full?
It’s light on heat, full on loft. The airy Naia™ core keeps a plush, comforter feel without the heavy, trapped warmth.
Do I need a duvet cover?
No. It has a built-in, duvet-style shell, no shifting, no extra layers, no hassle.
Good for night sweats and humid climates?
Yes. The breathable weave and airy fill move heat and moisture away from your body, helping you stay drier and more comfortable.
Can couples with different temps make this work?
Yes, set the comforter with the side you want facing up (Arctic Silk for max chill, CloudKnit for softer cool) and fine-tune with your thermostat or a light layer. It balances comfort without the blanket battles.
Is it safe for sensitive skin?
Absolutely. OEKO-TEX® certified, hypoallergenic, and antibacterial, so it’s gentle on skin and stays fresher between washes.
Is it vegan? How does it compare to down?
It’s 100% vegan—no feathers, no animal by-products. You get cool, breathable loft without down’s heat, allergens, or special-care requirements.
How do I wash it? Will it clump?
Just machine wash and tumble dry, no cover to remove, no dry cleaner. The construction is designed to wash evenly and fluff back up after drying.
Can I use it year-round?
Yes. Use it solo in warmer months, then layer with a sheet or throw when temps drop.
What if I don’t love it?
You’re covered with a 30 day return period and a lifetime warranty sleep on it, stress-free
Care
Fully machine-washable and dryer-safe, no cover needed, no extra steps.
“This is literally the softest comforter you'll ever own. I purchased it for the functionality, but when I got it, I was blown away by the material and softness. Don't doubt, mellow, just get it.”
Tara M.
Verified Customer
Have A Question? See Our FAQs
Will it actually keep me cool all night?
It's built to. Instead of trapping your heat like a normal comforter, CloudCool Cooling Technology keeps air moving so heat and moisture escape through the night. Most hot sleepers tell us they stop waking up sweaty.
What makes it different from other cooling comforters?
Most "cooling" comforters are synthetic blankets with a cold-feeling coating that warms up within minutes. Ours cools two ways: a silky side that's cool the instant you touch it, and a breathable Naia wood-pulp fill that lets heat escape hour after hour. One cools you when you get in, the other keeps you cool until morning.
How quickly will I notice a difference?
Night one. The silky side feels cool the second you lie down, and most people notice they sleep through the night without the usual 3am kick-the-covers wake-up within the first few nights.
It's lightweight. Will it still feel like a real comforter?
Yes. It's light so it never weighs you down or traps heat, but it still has the drape and feel of a comforter you sleep under, not a thin sheet. For a hot sleeper, the light weight is the point.
What are the two sides?
One side is silky and cool the second you touch it. Flip it over and the knit side feels like a soft t-shirt: gentle and breathable. Both keep you cool. Pick whichever you want that night.
What is it made of?
The fill is Naia, a fiber made from sustainably sourced wood pulp. It's OEKO-TEX certified, hypoallergenic, 100% vegan, and gentle enough for a baby's skin.
How many should I order?
Most customers order one per bed, but plenty grab a second for the guest room, the couch, or laundry day so there's never a night without it. Ordering together also saves on shipping.
How do I wash it? Will it clump?
Machine wash cold, tumble dry low. The fill is built to wash evenly and fluff back up in the dryer, no clumping, no flat spots. No duvet cover and no dry cleaning needed.
Do I need a duvet cover?
No. The shell is built in, so there's nothing to wrestle into a cover and nothing extra to buy or wash.
Can I use it year-round?
Yes. Use it on its own in the warmer months, then layer a throw on top when temperatures drop. Plenty of customers use it all year.
When can I expect my order?
We'll email you when your order is placed and again when it ships, with tracking. Delivery times vary by location and are shown at checkout.
What if I don't love it?
You have 30 nights to sleep on it. If it's not the coolest comforter you've owned, send it back for a refund. It's also backed by a lifetime warranty.
The Award-Winning Cooling Comforter
Selling fast at the Summer Sale price.
100,000+ Happy Sleepers
The comforter made for people who sleep hot.
© Mellow LLC