Coolflex Premium Memory Hybrid Mattress
Mattress
Coolflex Premium Memory Hybrid Mattress
Size
Firmness
Construction
Depth (cm)
32
Layers
4
Layer Details
- Pillow Top. A plush pillow top acts as a built-in mattress topper, filled with Comfort Foam layers. In practice this gives you extra cushioning and pressure relief the moment you lie down.
- Cool Gel Memory Foam. A generous layer of Cool Gel Memory Foam actively draws heat away from the body for a cooler sleep. It also gently moulds to your body shape, which means personalised pressure relief at your hips and shoulders.
- Pocket Springs. High tensile steel pocket springs sit in individual fabric pockets and move independently. That means the mattress adapts to changes in your weight distribution through the night, and you feel less of your partner's movement.
- Reinforced Edge Springs. An outer ring of firmer pocket springs reinforces the edges. You can sleep or sit right at the side without the mattress sagging away beneath you.
- Knitted Cover. A knitted cover finishes the mattress. It is hypoallergenic and vegan friendly, useful if allergies are a concern.
Layer details from mattressnextday.co.uk product page, September 2026.
- Stretching room for one: At 120cm wide, a solo sleeper gets the full benefit of the pillow top's cushioning without ever reaching the edge of the bed.
- Fits the awkward room: The UK small double is 15cm narrower than the UK double, which can be the difference between a door that clears and one that does not.
- Usable right to the side: Reinforced edge springs matter more on a narrower mattress, letting you sleep close to the edge without it sagging away beneath you.
- Copes with occasional sharing: The 800 pocket springs move independently, so when a partner or guest does share, their movement is less likely to wake you.
- Cool for a snug room: Compact bedrooms often run warm, and the cool gel memory foam draws heat away rather than trapping it against you.
This size suits you if...
You sleep alone most nights and have outgrown a UK single, perhaps a teenager whose room cannot spare more floor space, or an adult in a studio or loft conversion where a standard double leaves no room to stand. It also suits a guest room or holiday let, where couples stay occasionally but nobody sleeps there every night.
Consider another size if...
You share the bed nightly with a partner, as 120cm is a squeeze for two adults long term. We'd recommend the UK double instead, which is 15cm wider and needs a room of at least 2.6m x 2.8m.
Similar Mattresses in This Price Range
Did you know? On Mattress Unboxed we have over 1,000 different mattresses to suit all types of sleepers. View all mattresses.
Is a small double Coolflex Premium Memory Hybrid big enough for a couple?
For occasional nights, yes: the pocket springs limit partner disturbance and the reinforced edges keep the full 120cm width usable. As an every-night bed for two adults, it is a squeeze, and the UK double, 15cm wider, is the better long-term choice if the room allows.
What room size do I need for the small double Coolflex Premium Memory Hybrid?
We suggest a room of at least 2.4m x 2.8m, which leaves enough space to walk round the bed and open drawers. That figure is Mattress Unboxed guidance rather than Coolflex's. In a box room or loft conversion, measure the narrowest point before you order, including the door swing.
What bedding fits the Coolflex Premium Memory Hybrid small double?
Small double (4ft) fitted sheets, paired with a standard double duvet. The 4ft size is a standard UK width, so sheets and frames are easy to find on the high street. Given the mattress's depth, check the fitted sheet's stated maximum before buying deep-pocket alternatives elsewhere.
How much bigger is the small double than the single in this mattress?
The UK small double is 30cm wider than the UK single, and the two are the same length at 190cm. That extra width is the point: an adult or older teenager who has outgrown a single gains real spreading room without the footprint of a full double.
Should I size up to the double or king in this mattress?
If two of you will share every night, yes. The UK double is 15cm wider and needs a room of at least 2.6m x 2.8m. The UK king is 30cm wider and 10cm longer, and we suggest at least 2.7m x 2.9m for it. Sleeping solo, the small double is usually plenty.