Komfi Unity Memory King Size Mattress in a Box
The Komfi Unity Memory Mattress in a Box has a Neuform memory foam top layer that gently contours your body, which means you get a cushioned, shaped feel in a 19cm foam mattress.
- Contouring memory foam top layer
- Even head-to-toe support
- Removable washable cover
£299.71
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Komfi Unity Memory Mattress in a Box
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Mattress details
Mattress
Komfi Unity Memory Mattress in a Box
Size
Firmness
Construction
Eco-Friendly
Foam
Memory Foam
Rolled
Depth (cm)
19
Layers
3
Layer Details
Neuform memory foam
A memory foam top layer that Komfi says gently contours your body shape, which means it should cushion you and follow your outline as you lie down.
Reflex foam
A soft Reflex foam layer for gentle head-to-toe, edge-to-edge support, which means the support should feel even across the whole mattress.
Ecofoam base core
The Ecofoam base forms the core of the mattress and, Komfi says, has a reduced carbon footprint, so it gives the layers above a foundation with a lighter environmental impact.
Layer details from komfi.com product page, October 2026.
Key benefits
- More room each: At 75cm per person, the UK king gives each of you 7.5cm more than the UK double, which means fewer nudged elbows when one of you turns over.
- Length for taller sleepers: The 200cm length is 10cm longer than the UK double, so a partner over six foot is less likely to end up with feet hanging off the end.
- Space when schedules clash: If one of you is up long before the other, the UK king's extra 15cm of width puts a little more distance between you as the early riser gets out.
- A hugging feel across a wider bed: The memory foam top contours to each body separately, so on a UK king both of you get that enclosed feel with room to stay on your own side.
- Familiar bedding sizes: Standard king sheets fit, along with a 230 x 220cm king duvet, which is wide enough that a duvet tug of war becomes less likely.
This size suits you if...
You share the bed every night and keep running out of room on a UK double, one of you is over six foot and wants the extra length, or your alarms go off hours apart and you'd like a bit more distance between you in the mornings.
Consider another size if...
Your bedroom is smaller than our suggested 2.7m x 2.9m once wardrobes and bedside tables are in. We'd recommend the UK double instead, which needs at least 2.6m x 2.8m.
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FAQ's
Is the Komfi Unity Memory king size big enough for two people?
Yes, for most couples. The UK king gives 75cm each for two sharing, which is 7.5cm more per person than the UK double. That is enough for most pairs to sleep without regular contact, although if one of you sprawls, the gain over a UK double may feel modest rather than dramatic.
Is the Komfi Unity Memory UK king long enough if you're over six foot?
It's a good fit for most tall sleepers. The UK king is 200cm long, or 6ft 6in, which is 10cm longer than the UK double. If height rather than width is your main problem, that extra length is the real reason to choose the UK king over the smaller sizes of this mattress.
What size bedroom do you need for a Komfi Unity Memory king?
We suggest at least 2.7m x 2.9m, with 3.2m x 3.2m feeling comfortable. New build master bedrooms can feel smaller than expected once fitted wardrobes take their share, so measure from the wardrobe doors when open, rather than wall to wall, before ordering.
What duvet and sheets fit the Komfi Unity Memory UK king?
Standard UK king sheets fit the 150 x 200cm surface, and a 230 x 220cm king duvet suits it well. The mattress is 19cm deep, so most standard fitted sheets will grip it without needing extra-deep pockets.
Should I get the Komfi Unity Memory in a double or a king?
Choose the UK king if you share and want more space each or extra length: it's 15cm wider and 10cm longer than the UK double. If your room is tight, the UK double needs at least 2.6m x 2.8m.