Komfi Unity Deluxe Mattress
Mattress
Komfi Unity Deluxe Mattress
Size
Firmness
Firm
Construction
Depth (cm)
17
Layers
2
Layer Details
- Reflex Foam. A flexible reflex foam layer that supports spinal alignment, which means your back stays level rather than sagging into the mattress. It's the backbone of the Unity Deluxe's firm feel.
- Ecofoam. Made from recycled materials, this layer lowers the mattress's carbon footprint while adding a softer, cradling comfort above the firmer base. It takes a little edge off the firmness without undermining the support.
Layer details from mattressonline.co.uk product page, September 2026.
- Real space for one sleeper: At 120cm across, the UK small double is 30cm wider than the UK single, which means room to stretch out without giving up firm support.
- Fits rooms a double cannot: It is 15cm narrower than the UK double, so a studio or box room keeps its walking space and the door still clears.
- Light enough for awkward stairs: The shallow 17cm all-foam build is easier to carry into a loft conversion or up a narrow staircase than a deep sprung mattress.
- Firm feel for occasional sharing: The reflex foam core keeps two guests level for the odd night, without the roll-together dip softer budget foams can develop.
- Budget-friendly in a practical size: The Unity Deluxe sits at the affordable end of the market, and you can compare the retailers listed on this page for the current price.
This size suits you if...
You're a solo adult who has outgrown a single and wants room to spread out, your bedroom is compact and a full double would leave no floor space, or you're furnishing a guest room or holiday let where couples stay occasionally rather than nightly. The firm feel suits back and stomach sleepers best.
Consider another size if...
You share the bed every night, as 120cm is tight for two adults long term. We'd recommend the UK double instead, which is 15cm wider and the same length; allow at least 2.6m x 2.8m of room.
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Is a UK small double Komfi Unity Deluxe big enough for a couple?
For occasional stays, yes. The firm reflex foam core keeps two sleepers supported rather than rolling together, which helps on a narrower mattress. For every night, 120cm of width is a squeeze for two adults, and we'd recommend the UK double of this mattress, which is 15cm wider and the same length.
Will the small double Unity Deluxe fit in a box room?
In most cases, yes. At 120 x 190cm it is 15cm narrower than a UK double, which is often the difference between a door that opens fully and one that doesn't. We suggest a room of at least 2.4m x 2.8m so you can still walk around the bed comfortably.
Is the Komfi Unity Deluxe small double good for a teenager?
It's a sensible step up. The UK small double is 30cm wider than the UK single but the same length, so a teenager gains real sleeping space without the room losing much floor. The firm feel supports a growing back well, although lightweight side sleepers may find it a little unforgiving on the shoulders.
Is this mattress easy to move upstairs in this size?
Easier than most. It's an all-foam mattress with a shallow 17cm profile, so the UK small double is lighter and more flexible to manoeuvre than a sprung mattress of the same footprint. That makes it a practical choice for loft conversions, flats and holiday lets with narrow staircases.
Where can I buy the Komfi Unity Deluxe in a small double?
Availability shifts, so the most reliable answer is the live comparison table on this page, where prices are updated as retailers change them. The 4ft size uses standard UK small double fitted sheets, which are widely stocked, and most people pair it with a standard double duvet.