Stay cool all night with the Arc-Chill Cooling Blanket

Two options. The 170 x 130cm single comes in Lavender Grey, a muted blue-violet, at £44.99. The 200 x 150cm double comes in Grey, a neutral mid-grey, at £53.99. Pick one above and the photographs change to that exact blanket — every image you see is the option you are buying.

It lists one more: a Light Blue in the 170 x 130cm size. We have chosen not to sell it, because the manufacturer illustrates that listing with the same grey photographs it uses for the grey double — there is no actual light-blue photograph in its media. We are not willing to show you a grey blanket and call it blue. If you specifically want it, email us and we will find out what the real colour is before you commit.

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.

It will lie across one, but it will not tuck in on both sides the way a duvet does. That is what 170 x 130cm means in practice, and 'smaller than expected' is the most common complaint in reviews of cooling blankets generally. If you want the bed covered, take the 200 x 150cm.

The colour and the price, and nothing else that matters. Same Arc-Chill fabric, same two-sided construction, same care rules, same storage pouch. The single is Lavender Grey at £44.99, the double is Grey at £53.99.

It genuinely feels cold when you first touch it, and that part is measurable. The yarn conducts heat away from your skin quickly instead of insulating, so your hand loses warmth to the fabric and reads it as cold. The maker rates this fabric at Q-Max 0.43, where ordinary cool-touch fabrics sit nearer 0.2.

Q-Max is the industry measure of how much heat a fabric draws from your skin in the first instant of contact, in watts per square centimetre. Higher means a stronger cold sensation. Anything above about 0.2 is sold as cool-touch, so 0.43 is at the stronger end. This figure is the manufacturer's rating for the fabric, not our own laboratory test.

The strongest cold hit is in the first moments, as with any cooling fabric. After that the blanket works by conducting and releasing heat rather than trapping it, so it stays cooler than cotton or fleece through the night, and it feels cold again whenever you move to a fresh patch. It is not refrigeration.

Yes, but it works better with moving air, because the heat the blanket pulls away has somewhere to go. On a very hot night a fan and this blanket together do far more than either alone. That is worth knowing before you buy in the middle of a heatwave.

The single, without question. One of you has it as a personal cooling layer while the other keeps the duvet, so a shared bed can run at two temperatures. The double would give you both the same thing, which is exactly the problem when one of you runs cold. It is also the cheaper answer.

The reverse is a softer brushed knit rather than cooling fibre, so it is what you want on a cool spring or autumn night. Flip the blanket over and it behaves like a normal light throw, which is why it does not need to go in the loft in September.

The single is 0.7kg. We do not have a confirmed weight from our supplier for the double, so we will not quote one — it is the same fabric over roughly 1.4 times the area, so expect around a kilo, but treat that as our arithmetic rather than a specification. Either way it is deliberately light; it is the opposite of a weighted blanket.

A nylon and polyester blend, knitted differently on each face: a dense, smooth cooling knit on the front and a softer brushed knit on the back. It is not cotton — cotton holds heat and moisture, which is exactly the problem this is built to avoid.

It is smooth and silky rather than fluffy, closer to a jersey sheet than to fleece. If you specifically want the fuzzy, warm feel of a fleece throw, this is not that, by design — fuzz traps air and air traps heat.

Cold machine wash at up to 30°C on a gentle cycle, then hang it to dry. It dries quickly. Do not tumble dry, iron, bleach or dry clean it: heat damages the fibre finish that makes it feel cold, and that damage is not reversible. For the double, check your drum capacity — a 7kg machine handles it, but do not cram it into a smaller one.

The cooling comes from how the yarn is made and knitted, not from a spray-on coating, so normal cold washing does not wash it out. What does harm it is heat, which is why the care rules matter. Follow them and the cool feel should hold up.

Yes, and both sizes come with a pouch for exactly that. The single packs down small and light, so it travels well to a hotel with no air conditioning, a long flight, a caravan or a campsite. The double packs away too but is more of a bagful; it is the better sofa throw of the two.

It is an ordinary textile blanket with no electrics, batteries or coolant, so there is nothing to leak or overheat. As with any blanket, do not leave it loose over a baby or an infant sleeping unsupervised. Pets can lie on it, though claws can snag a fine knit.

Plenty of people buy cooling blankets for that reason, and a lighter, cooler, faster-drying layer is more comfortable than a heat-trapping duvet. But we will not go further than that: this is a comfort product, not a medical device, and it does not treat or cure any condition. If night sweats are new or worrying, please talk to your GP.

Yes, we deliver both sizes across the UK. Your delivery estimate and any options are shown at checkout before you pay, so you can see the timing for your address before you commit.

Both sizes are over our free UK delivery threshold, so delivery is free either way. Any charge on smaller orders is worked out at checkout and shown before you confirm — nothing is added after you pay.

Yes. If it is not right, return it in line with our returns policy. Keep the pouch and packaging where you can, as it makes the return tidier, and get in touch first so we can point you at the right address.

A specific warranty length is not confirmed in our product record, so we will not state a figure we cannot stand behind. Your statutory rights apply in full, and if it arrives faulty or fails early we will put it right. Ask us before buying if a written warranty matters to you.