Komfi Unity Comfort Single 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
£112.32
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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
- Fits almost any bedroom: At 90cm wide, this single leaves floor space free in a compact room, so a child's bed can sit alongside a wardrobe, desk and toy storage.
- Boxed delivery suits awkward spaces: The rolled, compressed format is genuinely useful for a loft conversion or a bedroom at the top of a narrow staircase.
- Budget-friendly for spare rooms: Its low price makes furnishing a guest room, or fitting two beds where siblings share, far less painful than buying at full mattress prices twice.
- A practical first-flat choice: Student rooms and rentals often come with a single frame but no mattress, and this fills that gap without a big outlay.
- Cheap, easy bedding: Single sheets and duvets are the most widely stocked and least expensive of any UK size, which keeps ongoing costs down too.
This size suits you if...
You're buying for a child's or teenager's room where the bed shares floor space with a desk and storage, you need an affordable mattress for a spare room or a student flat where the frame is already provided, or you want two beds in one guest room without spending heavily on either.
Consider another size if...
You're an adult who wants more width to stretch out, or you occasionally share the bed. The UK small double would suit you better: it's 30cm wider at the same length, and we suggest allowing at least 2.4m x 2.8m of floor space for it.
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FAQ's
What room size do I need for the Komfi Unity Comfort UK single?
We suggest allowing at least 2.1m x 2.8m of floor space, which gives you room to walk around the bed and open drawers. Because the UK single is only 90cm wide, it also works where other sizes don't: under the slope of a loft conversion, or in a child's room competing with a desk and wardrobe.
Will the Komfi Unity Comfort UK single fit a bunk bed or mid sleeper?
The 90 x 190cm footprint matches standard UK bunk and mid-sleeper frames. Raised frames often have a maximum mattress depth for safety rails, though, and Komfi doesn't publish full specifications for this model, so check the depth on the retailer's listing against your frame's limit before ordering.
Is the UK single version of this mattress big enough for an adult?
Yes for one sleeper: at 3ft x 6ft 3in it's the standard UK one-person size, and it suits guest rooms, student rooms and first flats well. Broader adults, or anyone used to spreading out, may find it a little narrow for every night. In that case the UK small double adds 30cm of width.
How does the UK single compare with the small double for this mattress?
The UK single is 30cm narrower than the UK small double, and the two are the same length. That extra width matters if an adult will sleep on it nightly, but the room needs to be bigger too: we suggest at least 2.4m x 2.8m for the UK small double, against 2.1m x 2.8m for the UK single.
Where can I buy the Komfi Unity Comfort in a UK single?
Compare the retailers listed on this page; the prices shown here are updated as retailers change them. Because stockists for this size are limited, there's little scope to shop around, so it's sensible to read the retailer's listing carefully, particularly on firmness and materials, which Komfi doesn't confirm in detail.