MattressNextDay Luxury Support Foam Mattress
Mattress
MattressNextDay Luxury Support Foam Mattress
Size
Firmness
Medium 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 through the night.
- Reflex Foam. Reflex foam conforms to the shape of your body, which means you get tailored support where you need it. It's designed to help your spinal alignment and posture, giving a comfortable, supportive night's sleep.
Layer details from mattressnextday.co.uk product page, September 2026.
- Real space for one: At 30cm wider than a UK single, you can shift position freely through the night, which matters more on medium firm foam that holds you where you land.
- Fits rooms a double won't: Being 15cm narrower than a UK double, it can be the difference between a door that clears the bed frame and one that doesn't.
- Compact room guidance: We suggest allowing at least 2.4m x 2.8m, less than any double size needs, so it works in lofts and studio flats.
- Firm support at guest room scale: The medium firm reflex foam keeps sleepers aligned rather than sinking, a reassuring feel for a guest bed used by different people.
- Easy bedding to find: 4ft is a standard UK size, so small double fitted sheets and frames are widely stocked, and a standard double duvet covers it comfortably.
This size suits you if...
You sleep alone and have outgrown a UK single, perhaps a teenager whose room can't spare the floor space a double takes, or you're furnishing a guest room or holiday let where couples stay occasionally rather than every night. It also suits downsizers whose new bedroom simply won't take a 4ft 6in frame but who still want more width than a single gives.
Consider another size if...
You share the bed every night, in which case 120cm of width gets tight over time. We'd recommend the UK double instead, which gives 67.5cm each for two sharing; allow at least 2.6m x 2.8m for it.
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Is a UK small double big enough for two adults on this mattress?
For occasional nights, yes. Two people can share the 120 x 190cm surface comfortably enough for a weekend stay, and the medium firm foam limits roll-together. For nightly sharing it feels cramped, so a couple using it as their main bed would be happier on the UK double, which gives 67.5cm each.
What room size do I need for a small double mattress?
We suggest allowing at least 2.4m x 2.8m for a UK small double. That leaves enough room to walk round the bed and open drawers. It's a smaller footprint than the 2.6m x 2.8m we'd suggest for a UK double, which is why this size suits box rooms and loft conversions.
How much bigger is the UK small double than a single?
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 whole point of the size: a solo sleeper can stretch out or change position on the medium firm foam without their arm hanging off the edge.
Will a UK small double version of this mattress fit a loft conversion?
Often, yes. At 120cm wide it fits rooms where sloping ceilings leave no standing room beside a UK double, and it arrives rolled and boxed, so getting it up a narrow loft staircase is far easier than carrying a flat mattress. Just check you can allow around 2.4m x 2.8m of floor space.
Is this size a good choice for a guest room?
It's one of the better ones. A UK small double lets occasional couples share without dominating a small second bedroom, and the supportive medium firm feel suits guests of different builds and sleeping styles. Compare the retailers listed on this page for the current price in this size.