Komfi Vitality Max King Size Mattress in a Box
The Komfi Vitality Max Mattress in a Box has a Maxcool breathable top layer built to move air and regulate temperature, which means you should find it easier to stay comfortable if you tend to overheat.
- Cooling layer helps you sleep cooler
- Medium feel suits most sleepers
- Removable cover that washes easily
£441.71
Get the lowest price we've found
Save with the previous model
Some retailers still sell the earlier version of this mattress for less than the current model's best price.
Komfi Vitality Max Mattress in a Box
More available sizes
Mattress details
Mattress
Komfi Vitality Max Mattress in a Box
Size
Firmness
Medium
Construction
Foam
Rolled
Depth (cm)
30
Layers
3
Layer Details
Next Gen 4G Maxcool Layer
A breathable layer engineered to maximise airflow and regulate body temperature. It should help you avoid overheating through the night.
Ultra Soft Touch Layer
A cushioned layer that supports comfort and spinal alignment. It adds a softer feel under you without losing support.
Responsive Support Layer
A base layer that provides balanced support and maintains body positioning. It keeps you held evenly and stops the softer layers above from sinking too far.
Layer details from bedsonlegs.co.uk product page, October 2026.
Key benefits
- More room each: You each get 75cm of width, which is 7.5cm more per person than the UK double and enough to stop elbows meeting halfway through the night.
- Length for taller sleepers: At 200cm, or 6ft 6in, the UK king is 10cm longer than the UK double, which matters more than width if one of you is over six foot.
- A little more distance between you: The extra width puts slightly more space between two sleepers, which helps when one partner turns over or gets up hours before the other.
- One feel for both sides: The medium foam gives a middle-ground feel across the whole 150cm, so a back sleeper and a side sleeper sharing the bed are both reasonably catered for.
- Fits standard king frames: The 150 x 200cm footprint matches UK king bed frames, and the 30cm depth should sit comfortably on most of them.
This size suits you if...
You share the bed every night and keep ending up on the edge of a double, or one of you is tall enough that 190cm leaves feet hanging. It also suits couples on different schedules who want a bit more space between them when one gets up early.
Consider another size if...
Your bedroom falls short of our suggested 2.7m x 2.9m once wardrobes are in. We'd recommend the UK double instead, which needs at least 2.6m x 2.8m.
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.
FAQ's
How much space does each person get on a Komfi Vitality Max UK king?
Two people sharing a UK king get 75cm each. The UK double gives 67.5cm each, so the UK king adds 7.5cm per person. It sounds small on paper, but you'll feel it most when one of you sleeps on your side with knees bent or tends to drift towards the middle.
What size bedroom do I need for a Komfi Vitality Max king size mattress?
We suggest at least 2.7m x 2.9m for a UK king, with 3.2m x 3.2m feeling comfortable. New build master bedrooms can feel smaller than the floor plan suggests once fitted wardrobes and bedside tables go in, so measure the clear floor space rather than the whole room.
Is the Komfi Vitality Max UK king long enough for someone over 6ft?
The UK king is 200cm long, or 6ft 6in, which is 10cm longer than the UK double. For a partner around six foot or a little over, that extra length is often the real reason to size up, more than the width.
Should we get the Komfi Vitality Max in a UK king or a UK super king?
The UK super king gives 90cm each, so the UK king gives 15cm less per person, at the same length. The UK super king needs at least 3m x 2.9m by our guidance. If your room fits it and you sleep with a dog on the bed, the UK super king is the roomier choice.
What bedding fits a Komfi Vitality Max king mattress?
Standard UK king fitted sheets and a 230 x 220cm king duvet fit the 150 x 200cm size. The mattress is 30cm deep, so check the pocket depth on any fitted sheet before you buy, as shallower ones may struggle to stay tucked under the corners.