Komfi Unity Comfort Small Double Mattress in a Box
The Komfi Unity Comfort is a mattress in a box, which means it arrives rolled and compressed for easier delivery and manoeuvring up the stairs.
- Handy for a spare room
- Covers smaller bed frames well
- Boxed for easy handling
£138.80
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Komfi Unity Comfort Mattress in a Box
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Mattress details
Mattress
Komfi Unity Comfort Mattress in a Box
Size
Firmness
Medium
Construction
Rolled
Depth (cm)
Layers
2
Layer Details
Reflex foam top layer
A 4cm layer of soft reflex foam sits at the top. It gives the surface a softer, cushioned feel, which suits the medium firmness overall.
Ecofoam base
A 10cm foundation of Ecofoam, a re-engineered foam that is 100% recycled. It forms the bulk of the mattress and supports the softer layer above, and it also gives a lower carbon footprint than standard foam.
Layer details from komfi.com and archerssleepcentre.co.uk product pages, October 2026.
Key benefits
- Real space for one sleeper: At 120cm across, the UK small double is 30cm wider than the UK single, which means a solo adult can starfish rather than sleep to attention.
- Fits rooms a double cannot: It's 15cm narrower than a UK double, so it suits box rooms, lofts and studios where every centimetre beside the bed matters.
- Boxed delivery suits awkward rooms: The rolled, compressed format is easier to carry up narrow stairs or into a loft conversion than a rigid mattress would be.
- Sensible for occasional guests: Two people can share it for the odd weekend, which makes it a practical choice for a guest room nobody uses nightly.
- Budget price, modest commitment: The Unity Comfort sits at the affordable end of the market, a reasonable match for a size often bought for second bedrooms rather than the main one.
This size suits you if...
You're a solo adult who has outgrown a single and wants room to spread out, a parent replacing a teenager's bed in a room that can't lose much floor space, or you're kitting out a guest room or holiday let where couples stay occasionally rather than every night. Allow at least 2.4m x 2.8m of room and it should fit comfortably.
Consider another size if...
You share the bed every night, as 120cm gets snug for two over time. We'd recommend the UK double instead, which is 15cm wider; allow at least 2.6m x 2.8m of room for it.
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FAQ's
Is a small double Komfi Unity Comfort big enough for two adults?
For occasional nights, yes. At 120 x 190cm it gives a couple noticeably less width than a UK double, so it works well in a guest room where two people stay now and then. For a couple sharing every night, the UK double of this mattress is the safer buy.
What room size do I need for the small double Unity Comfort?
We suggest allowing at least 2.4m x 2.8m. That leaves enough space to walk around the bed and open drawers, which is exactly why this size is popular in box rooms and loft conversions where a UK double would leave no standing room on one side.
Will the boxed small double fit up narrow stairs or into a loft room?
That's one of the format's genuine strengths. The Unity Comfort arrives rolled and compressed in a box, so it's far easier to manoeuvre through tight landings, loft hatches and studio doorways than a full-size 120 x 190cm mattress would be. One person can usually manage it.
How much wider is the small double than the single?
The UK small double is 30cm wider than the UK single, and both are the same length at 190cm. That extra width is the whole point of this size: a teenager or solo adult gets meaningful stretching room without stepping up to a double's footprint.
Is the small double a good choice for a teenager's room?
Often, yes. It suits a teenager who has outgrown a single but whose bedroom can't spare the width a UK double takes. The budget pricing of the Unity Comfort fits that situation too, since it's a bed that may be replaced within a few years anyway.