Komfi Vitality Excel King Size Mattress in a Box
The Komfi Vitality Excel Mattress in a Box has four foam layers over a firm Responsive Support Core, which means you get push-back support under your shoulders, hips and lower back without any springs.
- Firm feel with push-back support
- Memory foam eases tension at hips
- Washable cover for easy care
£350.22
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Komfi Vitality Excel Mattress in a Box
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Mattress details
Mattress
Komfi Vitality Excel Mattress in a Box
Size
Firmness
Construction
Eco-Friendly
Foam
Memory Foam
Rolled
Depth (cm)
25
Layers
4
Layer Details
Neufoam memory foam comfort layer
A memory foam layer set below the outer cover that adapts to your body's shape. That eases tension around your joints and hips.
Breathable high-density foam layer
A high-density foam that promotes airflow. It helps keep the sleeping surface fresh and temperature-regulated.
Responsive Support Core
A firm foam layer that cushions pressure points like shoulders, hips and lower back. It keeps push-back support so you don't sink too far.
Ecofoam foundation
A high-density base made from 100% recycled foam offcuts. It gives the mattress a stable footing while reducing its carbon impact.
Layer details from komfi.com product page, October 2026.
Key benefits
- More personal space: At 75cm each for two sharing, the UK king gives you 7.5cm more than a UK double, which means slightly more room before you drift into your partner's half.
- Length for taller sleepers: The 200cm length adds 10cm over a UK double, a real relief if one of you is approaching 6ft and is used to feet hanging over the end.
- Fewer early-morning collisions: If one of you is up hours before the other, the wider surface gives the early riser more space to roll out without crossing the middle.
- Firm support edge to edge: The firm Responsive Support Core runs the full 150cm width, so both of you get the same push-back, although lighter side sleepers may find it a little unyielding.
- A middle ground on floor space: For room size, we suggest at least 2.7m x 2.9m for the UK king, compared with 3m x 2.9m for the UK super king.
This size suits you if...
You share the bed every night and keep ending up in each other's space on a UK double, one of you is approaching 6ft and needs the extra length, or you keep different hours and want more distance when one of you gets up early.
Consider another size if...
Your bedroom is under our suggested 2.7m x 2.9m, which is common in new build master bedrooms once wardrobes go in. We'd recommend the UK double instead, which needs at least 2.6m x 2.8m.
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FAQ's
What are the dimensions of the Komfi Vitality Excel UK king?
The UK king measures 150 x 200cm, or 5ft x 6ft 6in, and is 25cm deep. To compare prices for the Komfi Vitality Excel in this size, check the retailers listed on this page.
Is the Komfi Vitality Excel in a UK king big enough for two people?
For most couples, yes. You get 75cm each, which is 7.5cm more each than a UK double. If you both sprawl, or a dog regularly joins you, the UK super king gives 90cm each, although it needs a larger room.
Will a Komfi Vitality Excel king size fit my bedroom?
We suggest allowing at least 2.7m x 2.9m, with 3.2m x 3.2m feeling comfortable. Measure once wardrobes and bedside tables are in place, as new build bedrooms often feel smaller than the floor plan suggests.
What bedding fits a Komfi Vitality Excel UK king?
Standard king sheets fit, along with a 230 x 220cm king duvet. Because the mattress is 25cm deep, check that your fitted sheet's pocket depth is generous enough to tuck under comfortably.
Should I get the Komfi Vitality Excel in a UK king or UK super king?
Both are 200cm long, so taller sleepers get the same length either way. The UK king is 30cm narrower, giving 15cm less each, but needs less floor space: we suggest 2.7m x 2.9m against 3m x 2.9m for the UK super king.