Komfi Unity Comfort Eco Foam Mattress
Mattress
Komfi Unity Comfort Eco Foam Mattress
Size
Firmness
Construction
Depth (cm)
14
Layers
2
Layer Details
- Comfort Layer. A high-density Reflex foam comfort layer, which means the surface responds to your shape while keeping a medium level of support. It's the part you'll feel first when you lie down.
- Support System. A sturdy core of Ecofoam, made from fully recycled materials, moulds to your body to encourage healthy posture. That contouring helps reduce tossing and turning through the night.
Layer details from mattressonline.co.uk product page, September 2026.
- Real stretching room for one: At 4ft wide you can change position freely through the night, which a standard single rarely allows a full-grown adult.
- Fits rooms a double would crowd: We suggest at least 2.4m x 2.8m for a UK small double, so it works in box rooms and studios where a bigger frame would block the door.
- A budget size for a budget mattress: The Unity's modest price suits the small double's typical roles, guest rooms and second bedrooms, where spending heavily rarely makes sense.
- Light enough to move upstairs: An all-foam build in a 4ft size is far easier to carry into a loft conversion or up a narrow staircase than a sprung double.
- Greener core, standard size: The Ecofoam support layer is made from fully recycled materials, and 4ft is a common UK size, so frames and fitted sheets are easy to find.
This size suits you if...
You sleep alone and have outgrown a single but your room can't give up the floor space a double needs, you're furnishing a guest room where couples stay for the odd night rather than every night, or you're fitting out a small second bedroom in a rental or holiday let and want a low-cost mattress in a size that leaves walking room.
Consider another size if...
You share the bed every night, because 120cm gets tight for two adults over time. We'd recommend the UK double instead; it's 15cm wider, the same length, and we suggest at least 2.6m x 2.8m of room for it.
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Is the Komfi Unity small double big enough for two adults?
For occasional nights, yes. Couples staying in a guest room can share a 120cm width comfortably enough for a weekend. For nightly sharing it's a squeeze, and the Unity's slim 14cm depth adds to that for heavier pairs. If two of you will sleep on it every night, the UK double, 15cm wider, is the safer buy.
Will the Komfi Unity small double fit in a box room?
Usually, and that's much of the point of this size. We suggest a room of at least 2.4m x 2.8m for a UK small double, which leaves space to open the door and walk around one side. Measure before ordering, and remember to account for wardrobes and radiators, since our guidance assumes a fairly clear floor.
What are the dimensions of the Komfi Unity small double?
It measures 120 x 190cm, which is 4ft x 6ft 3in. That's 30cm wider than the UK single and the same length, so a taller sleeper gains no legroom by sizing up, only width. Use standard small double (4ft) fitted sheets; a regular double duvet drapes nicely over it.
Should I get the small double or the double in the Komfi Unity?
It comes down to who sleeps on it and how big the room is. The UK small double is 15cm narrower than the UK double and the same length. Sleeping solo, or hosting occasional guests in a compact room, the small double is plenty. Sharing nightly, choose the UK double and allow at least 2.6m x 2.8m for it.
Is the small double a good upgrade for a teenager moving on from a single?
It's a popular one. The UK small double gives 30cm of extra width over the UK single with no extra length, so the room loses less floor space than a full double would take. The Unity's low price helps too, since teenagers tend to outgrow or move on from mattresses sooner than adults do.