MattressNextDay Ortho Support Foam Mattress
Mattress
MattressNextDay Ortho Support Foam Mattress
Size
Firmness
Extra Firm
Construction
Depth (cm)
20
Layers
2
Layer Details
- Knitted Cover. A soft knitted cover that's breathable, which means heat can escape rather than build up around you. It helps keep you at an even temperature all night.
- Reflex Foam. Reflex foam is a dense, responsive foam that conforms to the shape of your body. It offers tailored support to help improve your spinal alignment and posture.
Layer details from mattressnextday.co.uk product page, September 2026.
- Stretching room for one: At 120cm across, the UK small double is 30cm wider than the UK single, which means you can change position freely without your arm leaving the mattress.
- Firmness that fills the width: The extra firm reflex foam feels consistent right to the edges, so the full 120cm is usable rather than a softer strip in the middle.
- Fits compact double bedrooms: It's 15cm narrower than the UK double, which can be the difference between a door clearing and a room that no longer functions.
- Practical for a guest room: Occasional couples can share for a weekend, and the solid surface means neither guest rolls into the other.
- Standard 4ft bedding: Small double frames and fitted sheets are widely stocked in the UK, so kitting this size out is straightforward.
This size suits you if...
You sleep alone but have outgrown a single, perhaps a teenager whose room can't spare more floor space than a 4ft frame takes, or an adult in a studio or box room where every centimetre counts. It also fits a second bedroom that hosts the occasional couple rather than a nightly pair, provided you specifically want an extra firm, no-frills orthopaedic feel.
Consider another size if...
You share the bed every night, as 120cm is snug for two on a surface this firm. We'd recommend the UK double instead, which gives 67.5cm each for two sharing and needs a room of at least 2.6m x 2.8m.
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Is a small double ortho mattress big enough for two adults?
For the odd night, yes. The UK small double is 120cm wide, and because this mattress is extra firm you won't roll towards each other, which helps two guests share comfortably. For nightly sharing it's tight: the UK double adds 15cm of width and gives 67.5cm each, which most couples find noticeably easier to live with.
What room size do I need for the small double Ortho Support Foam Mattress?
We suggest a room of at least 2.4m x 2.8m for a UK small double. That leaves enough space to walk round the bed and open drawers. Since this is a simple 20cm deep foam mattress, it suits low frames and divans in loft conversions or box rooms where headroom beside the bed is limited.
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. On an extra firm surface that added width matters, because you don't sink into a central dip; the whole 120cm stays flat and usable, so a restless solo sleeper gets genuine spreading room.
Will the small double size suit a teenager moving up from a single?
It's a sensible step up. The extra 30cm of width gives a growing teenager proper space without taking the floor area a full UK double demands, and the extra firm reflex foam supports a heavier adult build for years to come. Check they're happy with a very firm feel first, as dedicated side sleepers may find it hard on the shoulders.
What bedding fits the small double version?
You need small double (4ft) fitted sheets to match the 120 x 190cm mattress, and a standard double duvet works well on top. Both are easy to find in the UK, since 4ft is a standard size. Fitted sheets need to accommodate the 20cm depth, which most standard sheets manage comfortably.