Sleep cool, all night.
The Coolhaven Arc-Chill Cooling Blanket is knitted from a cooling fibre that pulls heat away from your skin instead of trapping it, so a close summer night stops ending with the duvet on the floor. Cooling side up in the heat, softer brushed side up when it turns — in a single size for one hot sleeper, or a double that covers the whole bed.
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Same Arc-Chill fabric, same two-sided construction, same care rules. Pick the size that matches your bed and who is sleeping under it.
| 170 x 130cm | 200 x 150cm | |
|---|---|---|
| Price | £44.99 | £53.99 |
| Colour | Lavender Grey — a muted blue-violet | Grey — a neutral mid-grey |
| Covers | One sleeper. Lies across a double but won't tuck in both sides | A standard UK double (135 x 190cm mattress) with overhang each side |
| Best for | Your own cool layer while a partner keeps the duvet | Two people who both sleep hot and want the whole bed cooler |
| Weight | 0.7kg | Not confirmed by our supplier — expect around 1kg |
| Travels well | Yes — packs into its pouch as a bundle | Packs away, but it's a bagful rather than a bundle |
Genuinely unsure? Send us your bed size and we'll tell you which one to buy — including when the cheaper one is the right answer.
Who it's for
This is not a blanket for cosiness. It is for the sleeper who kicks the duvet off, sleeps with one leg out, and has already tried the fan.
If you are fine when you get in and unbearable by 2am, the problem is a duvet storing your own heat. A conducting layer instead of an insulating one changes that.
One cooling blanket, one duvet, one bed, two temperatures. Far cheaper than two duvets or a cooling mattress, and it ends the nightly negotiation.
Almost nobody here has air conditioning, and a heatwave in a brick terrace is a long night. This plus a fan on low is the realistic version of sleeping cool.
0.7kg and a supplied pouch means it packs down small — for a hotel with no air con, a caravan, a long flight, or the sofa on a close evening.
How it works
Three things make the difference: the fibre, the second side, and how little it weighs.
The cooling side is knitted from Arc-Chill fibre — a dense, smooth yarn that conducts heat off your skin rather than insulating it. Its maker rates it Q-Max 0.43, where ordinary cool-touch fabrics sit nearer 0.2. You can feel the difference with your hand before you ever get into bed, and the cold sensation comes back whenever you move to a fresh patch.
This is the fold: the dense cooling knit on top, the softer brushed reverse underneath. Flip the blanket and you get a normal light throw with none of the cold bite — the side you want on a cool spring or autumn night, or over a duvet in winter. One blanket that earns its place on the bed for most of the year, rather than six weeks of it.
The 170 x 130cm single comes in Lavender Grey, a muted blue-violet. The 200 x 150cm double comes in Grey, a neutral mid-grey — that's the one pictured here. Switch between them on the product page and every photograph changes with your choice, so what you see is always what you're buying.
A lot of feeling hot in bed is simply weight and trapped air, so this is deliberately thin — 0.7kg in the single size. It machine washes cold at 30°C and air dries quickly — no tumble dryer, no iron, no dry cleaning, because heat is the one thing that harms the fibre. The supplied pouch means it travels to the sofa, the car or a hotel room.
The complete guide
Cooling blankets are one of the few bedding products where the mechanism is simple and measurable — but the market is full of near-identical grey throws with wildly different fabrics behind them. This guide covers what separates a blanket that genuinely feels cold from one that just says so on the label, and what to check before you spend.
Ordinary bedding insulates. Cotton, fleece and microfibre hold a layer of warm air against your skin, which is exactly what you want in winter and exactly the problem in a heatwave. A cooling blanket does the opposite: it is knitted from a dense, smooth fibre that conducts heat out of your skin and releases it into the air. Nothing is plugged in, frozen or refilled — the effect comes from the yarn and the knit, so it works from the moment you take it out of the pouch and keeps working as long as the heat has somewhere to go.
Q-Max is the standard measure of how much heat a fabric pulls from your skin in the first instant of contact, in watts per square centimetre. Fabrics above roughly 0.2 get marketed as cool-touch; the better cooling blankets are rated between 0.35 and 0.5. Our blanket's fibre is rated Q-Max 0.43 by its maker. Treat any listing that does not quote a figure at all with suspicion, and remember that these are manufacturer ratings — useful for comparing products, not independent test results.
Cooling blankets are sold in throw sizes far more often than bed sizes, and "smaller than expected" is the single most common complaint in reviews of every brand. Check the centimetres, not the word. A 170 x 130cm blanket is a personal layer for one sleeper: it lies across a double bed but will not tuck in on both sides. To cover a UK double (135 x 190cm mattress) properly you want something around 200 x 150cm, which is why we stock both. And if only one of you runs hot, the single is not a compromise at all — it is the better answer, because you each keep your own top layer instead of arguing over a shared one.
Single-sided cooling blankets are cold on both faces, which is great in August and useless in October. Double-sided ones pair a cooling knit with a softer brushed reverse, so the same blanket carries you through spring and autumn as a light throw. For most UK homes, where genuinely hot nights come in short bursts rather than months, the double-sided version gets far more use per pound.
Look for something under about a kilo. Part of feeling hot in bed is simply the weight and trapped air of a thick quilt, so a cooling blanket should feel thin. On care, nearly every cooling fabric has the same rule: cold machine wash, air dry, and no heat at all. Tumble drying and ironing damage the fibre finish that produces the cool feel, and that damage is permanent — the single most common way people ruin a cooling blanket is one pass through a hot dryer.
A cooling blanket is not air conditioning, and no fabric will fix a 30-degree bedroom with no airflow. What it does is stop your bedding from working against you, which for most people is the difference between waking at 2am and sleeping through. Pair it with a fan on low aimed across the bed, windows opened late rather than in the afternoon, and a breathable mattress protector if your heat is coming from underneath. And if you are waking drenched most nights, or it is a new pattern for you, that is worth raising with your GP rather than solving with bedding.
Reviews
We're a new shop, so we publish reviews only from customers who bought here — and we won't pretend to have more than we do, or reprint ratings from somebody else's listing. Slept under it? Tell us how the night went and we'll publish genuine reviews on this page.
Got questions?
A cooling blanket is knitted from a dense, smooth fibre that conducts heat away from your skin instead of insulating it, so it feels genuinely cold when you touch it and stays cooler than cotton or fleece through the night. It is a fabric effect, not refrigeration — there is nothing to plug in, freeze or refill.
Q-Max measures how much heat a fabric pulls from your skin in the first instant of contact, in watts per square centimetre. Anything over about 0.2 is sold as cool-touch. The fibre in our blanket is rated Q-Max 0.43 by its manufacturer, which sits at the strong end of what you can buy in a normal blanket.
Yes, and that is how most people in the UK use one, because very few homes here have air conditioning. It works noticeably better with moving air though — a fan on low aimed across the bed gives the heat somewhere to go, and the two together do far more than either alone.
Two. The 170 x 130cm single in Lavender Grey at £44.99 is a personal layer for one sleeper. The 200 x 150cm double in Grey at £53.99 covers a standard double bed properly. Same fabric, same care rules, same two-sided construction — the size, the colour and the price are the only differences.
Measure the mattress, then think about who is under it. A UK double is 135 x 190cm, so the 200 x 150cm covers it with overhang on both sides. But if only one of you sleeps hot, buy the single instead and let your partner keep the duvet — a shared cooling layer just moves the argument rather than settling it.
That is the case it suits best. One person has the cooling blanket as their own top layer while the other keeps the duvet, so a shared bed can run at two temperatures. It costs far less than two duvets or a cooling mattress.
Cold machine wash at up to 30°C on a gentle cycle, then hang it up to dry — it dries fast. Never tumble dry, iron, bleach or dry clean it: heat is what damages the finish that makes the fibre feel cold, and that damage cannot be undone.
Orders are dispatched quickly and the delivery estimate for your address is shown at checkout before you pay. Delivery is free across the UK on orders over £40, so this blanket qualifies; smaller orders pay a flat £3.99.
Still deciding? Read the cooling blanket buying guide, or see the full specifications and both sizes side by side.
Coolhaven is a UK shop selling the Arc-Chill Cooling Blanket: a double-sided summer blanket for people who sleep hot. The cooling side is knitted from Arc-Chill fibre rated Q-Max 0.43 by the manufacturer, so it feels cold to the touch and conducts body heat away instead of trapping it; the reverse is a softer brushed knit for cooler nights. It comes in two options: 170 x 130cm (single/throw, 0.7kg, Lavender Grey, GBP 44.99) and 200 x 150cm (double bed, Grey, GBP 53.99). Both come with a storage pouch and are machine washable at 30°C with air drying only. The single size suits one sleeper, which makes it the answer for couples who disagree about temperature; the double suits two people who both sleep hot. It is a comfort product, not a medical device. Free UK delivery over GBP 40, easy returns and secure checkout.