For people who sleep warm
The Slumbair Muslin Blanket
Six layers of breathable 100% cotton muslin that let the heat out, so you can stay under the covers all night.
- Covered, not cooked. Open-weave cotton lets body heat escape through the blanket.
- 100% cotton, no synthetic blends. Gentle on skin, nothing plastic against you.
- Softer by the fifth wash. The crinkle relaxes, the cotton blooms. It only gets better.
- The size we promise. Cut generously so it lands on size after washing.
Choose your set
100-Night Real Trial · Free US shipping · Secure checkout
Tap the ones that sound like you
Is this you at 3am?
If you sleep warm, none of this is a character flaw. It's what happens when your blanket holds the heat in with you.
- One leg out from under the duvet, every single night
- Flipping the pillow to find the cold side
- Waking up warm and damp, then cold at 5am
- You can't sleep under just a sheet. You need to feel covered.
- He wants the heavy duvet, you want the window open
- The "cooling" blanket felt cold for a minute, then like plastic
- Winter heating makes the bedroom worse than summer
- Doing the covers-on, covers-off dance until the alarm
You're a warm sleeper. You still deserve the covers.Slumbair keeps you covered while letting the heat escape through six open layers of cotton.
Find my sizeHow it works
You don't need a colder blanket. You need one that lets the heat out.
While you sleep, your body warms a thin pocket of air under the covers. Dense blankets trap it. "Cooling" fabrics feel cold for a minute, then trap it too. Slumbair works like a screen door: you stay covered, and the warm air moves through.
Fleece, duvets & "cooling" microfiber
Tight, dense weaves hold still air. That's what makes them warm, and why you wake up kicking them off.
Slumbair · the 6-Layer Air Stack
Six loose-woven gauze layers with air between them: the body and drape of a real blanket, without the trapped heat.
Muslin's loose plain weave lets air move through the blanket, not just across it.
The layers are tacked, not fused, so they crinkle into air pockets: weight and cover, without the heat.
No synthetic blend. The cotton relaxes with every wash, so it's softest when it's most loved.
Muslin shrinks a little on its first wash, so we cut generously. The size you order is the size you sleep under.
Airflow → cover without heat → softer every wash → a size you can trust
One blanket for every night of the year
On the bed all summerLight enough to sleep under alone on warm nights, so you're covered without cooking.
On the sofa all winterThe throw you reach for on movie night, over or under heavier bedding when the heating's on.
The thermostat truceYour blanket on your side, his duvet on his. Both of you sleep at your own temperature.
Machine-washableCool wash, low tumble. No dry cleaning, no ironing, ever. The crinkle is the point.
Better every yearMuslin softens with every wash, so year three feels even better than night one.
The gift that gets itFor the sister, mum or friend who's always too warm. Arrives ready to give.
What it's made of
Simple materials. Honest numbers.
No synthetic blends, no "cooling technology", no mystery sizing. Here's exactly what you're sleeping under.
| Fabric | 100% cotton muslin (gauze) |
|---|---|
| Construction | 6 open-weave layers |
| Feel | Light, airy, natural crinkle |
| Best for | Warm sleepers, all year |
| Care | Machine wash cool, gentle cycle. Tumble dry low. No bleach or fabric softener. No ironing needed. |
| First wash | Wash once before night one. Expect a few percent of natural cotton shrinkage, already allowed for in our cut. |
Size guide · finished sizes
Between sizes? Size up. Muslin is light, so extra fabric drapes instead of bunching.
What the sleep science says
Experts don't tell warm sleepers to go colder. They tell them to go lighter.
American Academy of Sleep Medicine
Keep the bedroom cool and sleep under light, breathable layers you can adjust.
Slumbair is that layer: breathable cotton you can sleep under alone, or pair with heavier bedding on cold nights.
University of Sydney sleep researchers
In warm conditions, breathability matters more than insulation.
Six open-weave layers are built for airflow first, which is why they feel so different from a duvet.
The muslin tradition
The fabric parents trust next to newborn skin, scaled up for adults.
Muslin has been the go-to breathable cotton for generations of swaddles. We made the grown-up version.
Slumbair is a bedding product, not a medical device. If heat at night is disrupting your sleep regularly, talk to your doctor.
Why warm sleepers switch to Slumbair
You've probably tried at least one of these. Here's how they stack up.
| slumbair | "Cooling" microfiber | Fleece or duvet | B1G1 ad-store muslin | |
|---|---|---|---|---|
| Lets body heat escape | ||||
| Feels like being properly covered | ||||
| 100% cotton, no plastic fibres | ||||
| Gets softer with every wash | ||||
| Real size, cut to allow for shrinkage | ||||
| 100-night trial, even after washing | ||||
| Use it all year round |
Warm sleepers, finally sleeping through
REVIEW TEXT 1
REVIEW TEXT 2
REVIEW TEXT 3
REVIEW TEXT 4
REVIEW TEXT 5
REVIEW TEXT 6
REVIEW TEXT 7
REVIEW TEXT 8
REVIEW TEXT 9
Individual experiences vary.
Questions, answered honestly
Will it actually be the size listed?
Yes. Muslin shrinks a few percent on its first wash, so we cut every blanket generously to land on the size we list: Throw 50×60 in, Queen 90×90 in, King 108×90 in. If yours doesn't, it's covered by the 100-Night Real Trial.
Is it really 100% cotton?
Yes: all six layers are cotton muslin, with no polyester or "cooling" synthetic blend. That's why it breathes and why it softens with washing instead of pilling.
Will it keep me cool?
It isn't cold to the touch, and it isn't meant to be. It works by letting the heat your body makes escape through the open weave, so you can stay covered without overheating. Most warm sleepers sleep under it alone from spring to autumn.
Is it warm enough for winter?
On its own it's a breathable layer, not a duvet. In winter, use it as your top layer over a sheet with the heating on, or keep it on your side of the bed while your partner keeps the heavier duvet.
Why does it look crinkled?
The crinkle is the point: it's what creates the air pockets between the layers. Muslin never needs ironing. It relaxes and softens over the first few washes.
Is it see-through or thin?
Six layers give it real body and drape. Held up to a window you'll see light glow through it, which is the open weave doing its job, but on the bed it looks and feels like a proper blanket.
How do I wash it?
Wash once before your first night. Machine wash cool on a gentle cycle, tumble dry low, no bleach and no fabric softener (softener coats the fibres and blocks airflow).
How does the 100-Night Real Trial work?
Sleep under it, wash it, use it for up to 100 nights. If it isn't for you, email us and we'll refund the blanket in full, washed or not. No restocking fee, no original packaging needed. Return postage is paid by the customer.
How long does shipping take?
Shipping is free within the US. Orders ship within 1–3 business days and arrive in 7–12 business days, with tracking emailed as soon as your order leaves us.
Is there a subscription or hidden fee?
No. You pay once, shipping is free, and there's nothing to cancel.
I have sensitive skin. Is it OK for me?
Muslin is one of the gentlest cotton weaves, and there are no synthetic fibres in it. If you have a specific allergy or skin condition, check with your doctor, and you still have the 100-night trial.
Can I use it for a baby or toddler?
Our blankets are sized and made for adults. Please don't use any loose blanket in an infant's crib. Follow safe-sleep guidance from your pediatrician.
Still wondering? Ask us anything. A real person answers within one business day.
Sleep on it for 100 nights. Then decide.
Most "guarantees" fine-print you into an exchange, or only accept returns that are unused, unwashed and still in the bag. Ours is the opposite: you're supposed to use it.
- 1Wash it, sleep under it, put it through real life for up to 100 nights.
- 2Not for you? Email us. No forms, no "reason required".
- 3Send it back, washed or not, and get a full refund for the blanket. No restocking fee.
Stay under the covers.
Tonight could be the first night in a long time you pull the blanket up to your chin and keep it there until the alarm.
The Slumbair Muslin Blanket6-layer 100% cotton · Throw, Queen, King · 7 colours