Komfi Unity Comfort Ortho Single Mattress in a Box
The Komfi Unity Comfort Ortho is a budget boxed mattress in five UK sizes, from small single up to king.
- Firm support for back & front sleepers
- Memory foam that moulds to you
- Removable cover washes in the machine
£155.75
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Komfi Unity Comfort Ortho Mattress in a Box
More available sizes
Mattress details
Mattress
Komfi Unity Comfort Ortho Mattress in a Box
Size
Firmness
Firm
Construction
Rolled
Orthopaedic
Depth (cm)
Layers
2
Layer Details
Memory foam
A 3cm memory foam layer designed to react to your body heat and mould to your contours. It gives the firm feel a little cushioning at the surface.
Ecofoam
A 17cm base of Ecofoam, made from 100% recycled foam, designed to give firm yet comfortable support. It does most of the work in holding you up, and it's why the mattress feels firm overall.
Layer details from archerssleepcentre.co.uk and aworldoffurniture.co.uk product pages, October 2026.
Key benefits
- Fits almost any room: At 3ft x 6ft 3in it needs only around 2.1m x 2.8m of floor space, so it works in box rooms and under loft slopes.
- Boxed delivery suits awkward spaces: It arrives compressed in a box, which means you can carry it up a bunk ladder route, a narrow staircase or into student halls without a struggle.
- A sensible price for a child's room: This sits at the budget end of the market, which makes sense for a growing child who will size up in a few years anyway.
- Easy, cheap bedding: Standard single sheets and a 135 x 200cm single duvet fit, and they're the cheapest and most widely stocked bedding of any UK size.
- Practical for guest and shared rooms: Two UK singles with a walkway between them can suit siblings sharing or a spare room set up for more than one guest.
This size suits you if...
You're buying for a child's or teenager's room where the bed shares space with a desk, wardrobe and toy storage, or you're kitting out a first flat or student room where the frame is provided and the budget is tight. It also makes sense for a spare room that doubles as an office, where a 90cm-wide bed leaves working space free.
Consider another size if...
You're an adult who sleeps starfish-style or you're over 6ft 3in, since the UK single is 10cm shorter than the UK king. We'd recommend the UK double instead; allow at least 2.6m x 2.8m of floor space for it.
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FAQ's
Will the Komfi Unity Comfort Ortho single fit a bunk or mid sleeper frame?
The 90 x 190cm footprint matches standard UK bunk, cabin and mid-sleeper frames. The one thing to check is depth: raised frames have a maximum mattress height marked on the guard rail, and Komfi doesn't publish a depth for this model, so measure against your frame's limit before buying.
Is the UK single Komfi Unity Comfort Ortho big enough for an adult?
At 90cm wide and 190cm long it's the standard UK one-person size, so most single adults sleep comfortably on it. Taller sleepers should note it's 10cm shorter than the UK king. If you tend to spread out, the UK small double is 30cm wider and the same length.
How much floor space does a UK single mattress need?
We suggest allowing at least 2.1m x 2.8m, which covers the mattress plus room to walk alongside and open drawers or a wardrobe. That modest footprint is why the UK single suits box rooms, loft conversions with sloped ceilings, and spare rooms that double as an office.
Can I fit two singles in one room for siblings sharing?
Often, yes. Each UK single is 90cm wide, so two beds plus a walkway between them fit comfortably in most average UK bedrooms, though you'll want more than our 2.1m x 2.8m single-bed minimum. Because this mattress arrives boxed, getting two of them upstairs is straightforward.
Does the Komfi Unity Comfort Ortho single arrive rolled in a box?
Yes, this is a boxed mattress, compressed and rolled for delivery. That matters more for a single than most sizes, because it's often going to awkward places: a child's room up narrow stairs, student halls, or onto a raised frame. Compare the retailers listed on this page for current prices.