Komfi Serenity Memory Pocket 1000 King Size Mattress in a Box
The Komfi Serenity Memory Pocket 1000 Mattress in a Box pairs a memory foam layer that softens with body heat with independent pocket springs, which means a medium feel that eases around you and still supports.
- Medium feel for most sleepers
- Foam that softens with body heat
- Removable washable cover
£322.67
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Komfi Serenity Memory Pocket 1000 Mattress in a Box
More available sizes
Mattress details
Mattress
Komfi Serenity Memory Pocket 1000 Mattress in a Box
Size
Firmness
Medium
Construction
Foam
Memory Foam
Pocket Spring
Rolled
Depth (cm)
20
Layers
2
Layer Details
Memory foam layer
A temperature-sensitive memory foam set below the cover that softens in contact with body heat. It means a gentle, contouring feel that adapts as you warm it.
Pocket spring core
Small-diameter pocket springs, each housed in its own cloth sleeve and working independently. This means support that responds to your body, with less of the whole bed moving at once.
Layer details from archerssleepcentre.co.uk product page, October 2026.
Key benefits
- More room each than a double: Moving up from a UK double gives you 7.5cm more each, which means a little more space to turn over without nudging your partner.
- Length for taller sleepers: At 200cm long, the UK king is 10cm longer than a UK double, so someone near six foot can stretch out without their feet reaching the end.
- Less disturbance between you: Each spring sits in its own sleeve and moves on its own, which means an early riser getting up should disturb the other side less.
- Steadier edges for getting up: Ecofoam around the perimeter springs limits sag, which helps if one of you is recovering and needs a firm side to sit on before standing.
- Room to shift and prop: With 75cm each, there's space for extra pillows during pregnancy or recovery, although the medium feel may lack cushioning for very light sleepers.
This size suits you if...
You share the bed every night and keep waking each other on a UK double, one of you is close to six foot and wants more length, or you're on different schedules and want a little more distance between you.
Consider another size if...
Your bedroom is smaller than 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.
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FAQ's
Is the Komfi Serenity Memory Pocket 1000 UK king big enough for two people?
For most couples, yes. The UK king gives 75cm each for two sharing, compared with 67.5cm on a UK double. If either of you sprawls, or a dog regularly joins you, you'll use that space up quickly, and Komfi doesn't offer this mattress in a UK super king.
How big a bedroom do I need for a king size Komfi Serenity mattress?
We suggest allowing at least 2.7m x 2.9m for a UK king, with 3.2m x 3.2m comfortable. New build master bedrooms can feel smaller than their floor plans suggest once fitted wardrobes are in, so measure the clear floor space before ordering.
Is the Komfi Serenity UK king long enough for someone over six foot?
The UK king is 200cm long, 10cm longer than the UK double. That makes it a better choice than a UK double for anyone approaching six foot. If you're well over six foot, measure your height against 200cm and allow some room for your pillow.
What size is a Komfi Serenity Memory Pocket 1000 king in feet?
The UK king measures 150 x 200cm, which is 5ft x 6ft 6in. It's 20cm deep, so check that your bed frame and fitted sheets suit that depth. King sheets and a 230 x 220cm king duvet will fit.
Will I feel my partner move on the Komfi Serenity king size?
Probably less than on a UK double. The pocket springs work independently, so less of the bed moves at once. The UK king also puts a little more distance between you. If you're a very light sleeper, you may still notice your partner getting in and out.