Bodyshape Boost 800 Pocket King Size Mattress
The Bodyshape Boost 800 Pocket Mattress pairs 800 individually pocketed springs with a Reflex foam comfort layer, which means you get a medium feel with some cushioning on top and springs that move independently below.
- Medium feel for most sleepers
- Reflex foam cushioning on top
- Breathable knitted cover
£235
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Bodyshape Boost 800 Pocket Mattress
More available sizes
Mattress details
Mattress
Bodyshape Boost 800 Pocket Mattress
Size
Firmness
Medium
Construction
Foam
Pocket Spring
Rolled
Depth (cm)
24
Layers
4
Layer Details
Microquilted comfort layer
A microquilted top filled with Reflex foam and cosy polyester fibres. It adds light cushioning over the springs, so the surface feels medium rather than hard.
Polyester fibre layer (above spring unit)
Dense polyester fibres sit above the spring unit. They add padding between you and the springs, so you feel the cushioning rather than the coils.
Pocket spring unit
800 individually pocketed springs, with the pockets secured together to form a single unit. Each spring works on its own, so the support follows your body.
Polyester fibre layer (below spring unit)
Dense polyester fibres sit below the spring unit. They form the underside of the mattress, between the springs and your bed base.
Layer details from mattressonline.co.uk product page, November 2026.
Key benefits
- More room each: At 150cm wide you each get 75cm, which is 7.5cm more each than the UK double, so elbows and knees meet far less often during the night.
- Fewer early-morning wake-ups: Each spring works inside its own pocket, which means one partner getting up hours before the other should send less movement across to the side still sleeping.
- Length for a tall partner: At 200cm long, the UK king is 10cm longer than the UK double, so a tall sleeper can stretch out without their feet hanging off the end.
- A middle feel for two: The medium rating suits couples who can't agree on firmness, although if either of you wants a properly firm surface, this mattress won't give it.
- Planned for real bedrooms: We suggest allowing at least 2.7m x 2.9m, which matters in a new build main bedroom where fitted wardrobes eat into the floor more than the plans suggested.
This size suits you if...
You share every night and keep running out of room on a UK double, one of you sets an alarm well before the other, or one of you is tall enough that a 190cm mattress leaves your feet near the edge.
Consider another size if...
Your bedroom measures under our suggested 2.7m x 2.9m, or you sleep alone. We'd recommend the UK double instead, which needs at least 2.6m x 2.8m.
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FAQ's
Is the Bodyshape Boost 800 Pocket UK king big enough for two adults?
For most couples, yes. You each get 75cm, which is 7.5cm more each than the UK double. If a child or a dog regularly joins you, though, that space disappears quickly, and the UK super king gives 90cm each, which is 15cm more per person.
Bodyshape Boost 800 Pocket king size dimensions in feet?
The UK king measures 150 x 200cm, which is 5ft x 6ft 6in. That is the standard UK king size, so king fitted sheets and a king duvet will fit. The mattress is 24cm deep, so check that your fitted sheet pockets suit that depth.
What size bedroom do I need for a UK king Bodyshape Boost 800 Pocket?
We suggest at least 2.7m x 2.9m, so you still have room to walk round both sides and open drawers. Measure the room with the wardrobes and bedside tables in place, check the stairs and doorways too, then compare the retailers listed on this page.
UK king or UK super king Bodyshape Boost 800 Pocket for a couple?
The UK super king is 30cm wider and gives 90cm each, against 75cm each on the UK king. Both are 200cm long, so a tall partner gains nothing extra in length by sizing up. The UK super king needs at least 3m x 2.9m, so let the room decide.
Is the UK king Boost 800 Pocket long enough for a tall partner?
At 200cm, the UK king is 10cm longer than the UK double, and that extra length is often the real reason taller sleepers move up a size. It is the same length as the UK super king, so you only need the wider UK super king if you also want more width.