Bodyshape Boost 800 Pocket Ortho King Size Mattress
The Bodyshape Boost 800 Pocket Ortho Mattress has 800 individually pocketed springs under a Reflex foam layer, which means you get a firm, supportive feel with a little cushioning on top.
- Firm feel for back sleepers
- Foam layer shapes around you
- Breathable fibres help dispel heat
£235
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Bodyshape Boost 800 Pocket Ortho Mattress
More available sizes
Mattress details
Mattress
Bodyshape Boost 800 Pocket Ortho Mattress
Size
Firmness
Firm
Construction
Foam
Orthopaedic
Pocket Spring
Rolled
Depth (cm)
24
Layers
4
Layer Details
Reflex foam
A layer of Reflex foam that shapes around your body. It gives a cushioned yet sturdy feel, so the firm surface isn't harsh.
Soft white fibres
Soft white fibres that increase airflow to help dispel heat. This means the mattress should feel fresher through the night.
Dense polyester fibres
Two layers of dense polyester fibres that enhance the firm feel. They also give the spring system extra support.
Pocket springs
A core of 800 pocket springs, each encased in its own fabric pocket. Each spring moves independently, so the mattress can respond to your body.
Layer details from mattressonline.co.uk product page, November 2026.
Key benefits
- More room each: The UK king is 15cm wider than the UK double, which works out at 7.5cm more each, enough to stop elbows meeting when one of you rolls over.
- Less disturbance from your partner: Each of the 800 pocket springs moves on its own, so a restless partner's movement should travel less across the width than on a single-unit spring.
- Length for taller sleepers: At 200cm long, the UK king is 10cm longer than the UK double, which matters if one of you is over six foot and has feet hanging off the end.
- Firm support across the whole surface: The firm feel suits back sleepers sharing the bed, and the wider surface gives each of you room to lie flat without drifting towards the middle.
- Fresher on a shared bed: Two people give off more heat than one, and the layer of soft white fibres is there to help air move and carry some of that warmth away.
This size suits you if...
You share the bed every night and keep waking when your partner shifts, or one of you leaves for work hours before the other. It also suits you if one of you is over six foot and the length of a double has never quite been enough.
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 Bodyshape Boost 800 Pocket Ortho UK king big enough for two people?
Yes, for most couples. The UK king gives 75cm each for two people sharing. If you both sprawl, or a dog regularly joins you, the UK super king gives 90cm each. That is 15cm more per person, but you'll need a larger room for it.
Bodyshape Boost 800 king vs double: how much extra space do you get?
The UK king is 15cm wider and 10cm longer than the UK double. Shared between two, that's 7.5cm more each. That's a modest-sounding figure, but it can be the difference between waking when your partner turns over and sleeping through.
What size bedroom do I need for a UK king Bodyshape Boost 800?
We suggest at least 2.7m x 2.9m, with 3.2m x 3.2m giving comfortable room to move around. New build master bedrooms can feel smaller once fitted wardrobes and bedside tables are in, so measure the clear floor space rather than the room on the plan.
Is the UK king Bodyshape Boost 800 Pocket Ortho long enough if you're over 6ft?
At 200cm (6ft 6in), the UK king is 10cm longer than the UK double, which helps anyone approaching or past six foot. The UK super king is the same length, so going bigger only adds width. If length is the only problem, the UK king is enough.
What bedding fits a king size Bodyshape Boost 800 Pocket Ortho?
Standard king sheets fit the 150 x 200cm surface, and a 230 x 220cm king duvet covers two sleepers comfortably. The mattress is 24cm deep, so check the pocket depth on any fitted sheet before you buy, particularly if you plan to add a topper.