Coolflex Essentials Pocket Mattress
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Mattress
Coolflex Essentials Pocket Mattress
Size
Firmness
Medium Firm
Construction
Foam
Pocket Spring
Hybrid
Depth (cm)
24
Layers
3
Layer Details
Knitted cover
A super-soft knitted cover with a touch of breathability, which means a gentler first impression when you lie down and a little help letting warm air escape.
Soft foam comfort layer
A layer of soft Reflex foam sits beneath the cover, cushioning shoulders and hips. It softens the feel of the springs below without making the mattress feel plush overall.
800 pocket spring unit
Pressure-reactive springs work independently, which means support tailored to where your body needs it and virtually no motion transfer across the bed. If you share, you should feel far less of your partner's movement.
Layer details from mattressnextday.co.uk product page, September 2026.
- Room to spread out alone: At 30cm wider than the UK single, this small double lets a solo adult roll over and starfish without ending up against the edge.
- Fits rooms a double crowds: It's 15cm narrower than the UK double, which can be the difference between a bedside table on each side or squeezing past the frame.
- Pocket springs, even at this price: The 800 pocket springs support each part of the small double independently, so a guest turning over barely registers on the other side.
- Slim profile suits smaller rooms: The 24cm depth keeps the bed looking proportionate in a compact space, and standard 4ft fitted sheets go on without a struggle.
- Sensible for a guest room: A medium firm feel with a soft foam top suits occasional couples and visiting relatives alike, without committing anyone to firm or plush.
This size suits you if...
You sleep alone and have outgrown a single but your room can't spare the width of a full double, you're furnishing a box room, loft conversion or small second bedroom where every centimetre of floor matters, or you need a guest bed that copes with the occasional couple. Allow at least 2.4m x 2.8m of floor space and it should sit comfortably.
Consider another size if...
You share the bed every night, since 120cm across two adults leaves little room to turn. We'd recommend the UK double instead, which is 15cm wider; allow at least 2.6m x 2.8m for it.
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Is a small double Coolflex Essentials big enough for a couple?
For occasional nights, yes. The 800 pocket springs work independently, so you'll feel little of a partner's movement, and the medium firm feel suits most positions. For every night sharing, 120cm of width is tight for two adults, and we'd point regular couples towards the UK double of this mattress instead.
What room size do I need for the Coolflex Essentials small double?
We suggest a room of at least 2.4m x 2.8m. That leaves enough space to walk round the bed and open drawers or a wardrobe. In a box room or loft conversion, the 15cm you save against a UK double often decides whether the door still clears the frame.
What bedding fits the Coolflex Essentials in a UK small double?
Small double, or 4ft, fitted sheets are the right fit, and at 24cm deep this mattress won't stretch standard-depth ones. For the top layer, most people use a standard double duvet, which drapes generously over the 120cm width. Both are easy to find, since 4ft is a standard UK size.
Is the small double a good upgrade from a single for a teenager?
It's a natural step up. The small double is 30cm wider than the UK single but exactly the same length, so it often fits where the single stood without swallowing the remaining floor space. The medium firm feel gives growing sleepers balanced support rather than anything too soft.
Where can I buy the Coolflex Essentials small double?
Coolflex is MattressNextDay's own-brand line, so it's sold direct rather than through a wide network of shops. The prices shown on this page are updated as retailers change them, so compare what's listed here before you buy rather than relying on an older quote.