Komfi Unity Memory Deluxe Mattress
Mattress
Komfi Unity Memory Deluxe Mattress
Size
Firmness
Medium Firm
Construction
Depth (cm)
17
Layers
3
Layer Details
- Neuform Memory Foam. A specialised Neuform memory foam layer sits at the top, cushioning you and lifting pressure off joints and muscles. It's also designed to reduce heat, which means a slightly cooler night than traditional memory foam tends to give.
- Reflex Foam. At the heart of the mattress, this soft, flexible reflex foam shapes around your contours. It absorbs movement and limits motion transfer, so a restless partner is less likely to wake you.
- Ecofoam. The base layer is Ecofoam, made from recycled foam and fully recyclable. It's a modest but genuine plus if sustainability matters to you.
Layer details from mattressonline.co.uk product page, September 2026.
- Real space for one: At 120cm wide, a solo sleeper can shift position freely all night, and the reflex foam core absorbs that movement so the mattress stays settled beneath you.
- Fits rooms a double overwhelms: The 4ft width suits box rooms, studios and loft conversions where a UK double would block a door or leave no walking space.
- Light to move upstairs: An all-foam construction at 17cm deep is far easier to carry into a small second bedroom or awkward loft than a heavy sprung mattress.
- Handles occasional sharing: Two people can manage the odd night on a small double, and the motion-absorbing foam means neither of you feels every turn the other makes.
- Standard size, easy bedding: 4ft is a recognised UK size, so small double fitted sheets and frames are straightforward to find rather than a specialist hunt.
This size suits you if...
You sleep alone but have outgrown a UK single, perhaps a teenager or an adult in a rented flat, and want stretching room without giving the bedroom over to the bed. It also fits if you're setting up a guest room or holiday let where couples stay occasionally rather than nightly, or you're downsizing and the new room simply won't take a UK double.
Consider another size if...
You share the bed every night, or either of you is a heavier adult who may press through this 17cm mattress. We'd recommend the Komfi Unity Memory Deluxe in a UK double instead; allow at least 2.6m x 2.8m of room for it.
Similar Mattresses in This Price Range
Did you know? On Mattress Unboxed we have over 1,000 different mattresses to suit all types of sleepers. View all mattresses.
Is the Komfi Unity Memory Deluxe small double big enough for two adults?
For occasional nights, yes. At 120 x 190cm it gives a couple noticeably less width than a UK double, and the 17cm depth means two heavier adults may press through to the firmer base. As a guest bed for visiting couples it works well; for nightly sharing, the UK double is the better buy.
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, which leaves enough room to walk around the bed and open the door comfortably. That guidance is ours rather than Komfi's, so measure your own room, including where wardrobes and radiators sit, before ordering.
Is the small double a good size for a teenager?
Often, yes. It gives a growing teenager 30cm more width than a UK single without swallowing a small bedroom, and the medium firm foam suits lighter bodies well, since they're less likely to press through the slimmer 17cm profile. It's the same 190cm length as a UK single, so very tall teens gain width, not legroom.
How does the small double compare with the UK king in this mattress?
The UK small double is 30cm narrower and 10cm shorter than the UK king, and a UK king needs a room of at least 2.7m x 2.9m by our guidance. The small double is the compact-room choice; the UK king is for couples with space to spare, and its page covers that in detail.
Will the Komfi Unity Memory Deluxe small double work in a loft conversion?
It's a strong fit. Sloping ceilings often leave no standing room beside a UK double, and the 15cm the small double saves in width can be the difference. Being all-foam and 17cm deep, it's also easier to manoeuvre up a narrow loft staircase. Compare the retailers listed on this page for current pricing.