Bodyshape Boost 800 Pocket Ortho Super King 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
£265
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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
- Room for two to spread out: Each of you gets 90cm, which means a partner who turns over all night is far less likely to wake you.
- Space when the family piles in: When a small child wanders in after a bad dream, the UK super king leaves the adults with room to stay asleep rather than clinging to the edges.
- Firm support across the full width: The Boost 800 is rated firm, so back sleepers get the same sturdy feel whether they sleep in the middle or near the edge.
- Springs that respond individually: The 800 pocket springs each move on their own, which means one sleeper's weight is less likely to drag the other side into a dip.
- Proportioned for a big room: In a large master or a high-ceilinged period bedroom, a UK super king looks in proportion, where a UK king can look a little lost.
- Fresher feel on a bigger bed: Soft white fibres help air move through the upper layers, which should keep the surface feeling fresher when two people share the warmth.
This size suits you if...
You share with a partner whose tossing and turning keeps waking you, or your children or a large dog regularly end up in the bed, and you want a firm, supportive surface in a bedroom with space to spare.
Consider another size if...
Your bedroom is smaller than our suggested 3m x 2.9m. We'd recommend the UK king instead, which needs at least 2.7m x 2.9m.
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FAQ's
What size bedroom do I need for a Bodyshape Boost 800 UK super king?
We suggest at least 3m x 2.9m for a UK super king. That leaves room to walk round the bed and make it. In a loft conversion, check where the ceiling slopes first, because the low side usually decides which wall the headboard can go on.
How much bigger is the Boost 800 UK super king than the UK king?
The UK super king is 30cm wider than the UK king, and both are the same length. For two people sharing, that gives you 15cm more each. If length is your issue rather than width, sizing up won't help, because neither is longer.
Is a UK super king Boost 800 big enough for two adults and a child?
With 90cm each for two adults, there's a reasonable gap for a young child to sleep between you without anyone being pushed to the edge. Bear in mind the mattress is firm, so a small, light child may find it hard, although most adjust for an occasional night.
What bedding fits a Bodyshape Boost 800 super king?
You'll need super king sheets and a 260 x 220cm duvet. The mattress is 24cm deep, so check the fitted sheet's pocket depth before you buy. Super king bedding also costs more than king, so factor in a new set if you're sizing up.
Will a UK super king mattress fit up my stairs and through the bedroom door?
At 180cm wide, a UK super king can catch on tight landing turns and doors that open inwards against a wall. Measure the narrowest point of the route first, then compare the retailers listed on this page. It's single-sided, so once in place you rotate it rather than flip it.