Coolflex Hybrid CHILL Single Mattress
The Coolflex Hybrid CHILL is a medium-feel hybrid built around cooling, with a gel-infused memory foam layer designed to draw heat away from you and a stitched-in pillow top for softness on top of the springs.
- Cool gel foam regulates temperature
- Plush pillow top that springs back
- Helps keep your spine aligned
£399
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Coolflex Hybrid CHILL Mattress
More available sizes
Mattress details
Mattress
Coolflex Hybrid CHILL Mattress
Size
Firmness
Medium
Construction
Foam
Pocket Spring
Hybrid
Memory Foam
Depth (cm)
37
Layers
4
Layer Details
Pillow Top
A plush pillow top with up to 1200 mini pocket springs, working like a stitched-in mattress topper. You get that soft, cushioned first touch without needing to buy a separate topper.
Cool Gel Memory Foam
Memory foam infused with gel microbeads to regulate temperature and improve breathability, designed to draw heat away from the body. In practice, that means the contouring feel of memory foam with less heat build-up overnight.
Comfort Foam
Layers of Comfort Foam that cradle pressure points and relieve pressure across the whole body. Side sleepers should notice this most around the hips and shoulders.
Pocket Springs
Up to 800 individually pocketed springs that move independently to target support where you need it and keep your spine aligned. Independent movement also means less disturbance when a partner shifts position.
Layer details from mattressnextday.co.uk product page, September 2026.
Key benefits
- Cooling in the size teens actually use: The gel-infused memory foam draws heat away overnight, which matters in a child's or teenager's room where the bed often sits against a radiator wall.
- Fits almost any room: At 3ft x 6ft 3in, the UK single leaves floor space for a desk, wardrobe and toy storage, so the bed doesn't dominate the room.
- A guest bed people compliment: The stitched-in pillow top gives a spare room or office-turned-guest-room a cushioned, hotel-ish feel without a separate topper to store.
- Room for two singles: In a shared siblings' room or a twin guest room, two UK singles plus a walkway fit where one larger bed wouldn't.
- Support scaled to lighter sleepers: The medium feel and pocket springs suit lighter solo sleepers well, contouring at the hips and shoulders rather than leaving them perched on top.
This size suits you if...
You're buying for a child or teenager who runs warm at night, you're a solo adult in a compact room or first flat where a 90cm width leaves space to live around the bed, or you're kitting out a spare room and want guests properly comfortable rather than merely accommodated.
Consider another size if...
You share the bed, or you're a solo sleeper who likes to sprawl. The UK double, 45cm wider and the same length, is the better call for couples; we suggest at least 2.6m x 2.8m of floor space for it.
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FAQ's
Will the Coolflex Hybrid CHILL UK single fit a bunk bed or mid sleeper?
We'd advise against it. At 37cm deep, this mattress is likely to sit above the safety rail on most bunk and mid-sleeper frames, and cabin beds usually specify a much shallower mattress. Check your frame's maximum mattress depth before buying; for raised frames, a slimmer mattress is the safer choice.
What size room do I need for a UK single Coolflex Hybrid CHILL?
We suggest allowing at least 2.1m x 2.8m of floor space. That gives you room to walk alongside the bed and open drawers or wardrobe doors. At 90 x 190cm, the UK single also suits awkward spaces like loft conversions, where a narrow footprint lets the bed tuck under the slope.
Is the UK single Coolflex Hybrid CHILL a good choice for a child?
For older children and teenagers, yes: the UK single is the standard one-person size and the cooling layers help warm sleepers. Two caveats. The plush pillow top is quite soft, which some parents prefer to avoid for younger children, and the 37cm depth rules out most raised frames.
Is a single Coolflex Hybrid CHILL big enough for an adult?
For one average-sized adult, yes. At 90cm wide there's no room to sprawl, but the pocket springs support a solo sleeper well and the length suits most people. If you're tall or a restless sleeper, the UK small double is 30cm wider and the same length, and worth considering.
Will standard single fitted sheets fit this mattress?
Possibly not. The Coolflex Hybrid CHILL is 37cm deep, which is taller than many standard single fitted sheets are cut for. Look for sheets labelled deep or extra deep in the UK single size, and measure your existing bedding before assuming it will stretch over the corners.