Sealy Posturepedic Elevate Blackwood Super King Mattress
The Sealy Posturepedic Elevate Blackwood is a firm mattress built around Sealy's patented AlignSupport coil system, which means you get a supportive, responsive feel rather than the sink-in softness of an all-foam bed.
- Comfort first, then deep support
- Allergy UK endorsed treatment
- Made in Britain, zero-to-landfill
£1,214
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Sealy Posturepedic Elevate Blackwood Mattress
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Mattress details
Mattress
Sealy Posturepedic Elevate Blackwood Mattress
Size
Firmness
Firm
Construction
Foam
Depth (cm)
Layers
4
Layer Details
SmarTex® surface layer
A smart fabric woven into the surface that disperses heat away from your body. In practice, this means less of that clammy, overheated feeling in the small hours.
Comfort Architecture
A blend of comfort layers and textiles sitting beneath the surface. This is the cushioning you feel first, before the support system takes over.
AlignSupport™ Coil
Sealy's patented coil system, exclusive to Posturepedic, responds to your body's contours with initial comfort followed by deep-down support. The coils are twice-tempered, which means they're heat-treated for long-lasting strength and consistent performance.
BasePlank™ Foundation
A solid base providing structural integrity from corner to corner. It works with the coil system above it to improve both support and airflow through the mattress.
Layer details from sealy.co.uk product page, September 2026.
Key benefits
- 90cm of width each: Two people sharing get 90cm each, which means a partner who turns over frequently is much easier to sleep through.
- Firm support across a 6ft width: The AlignSupport coil system holds its feel edge to edge, so neither sleeper rolls towards the middle of this 180cm-wide surface.
- Room for night-time visitors: When a child pads in at 3am, the 6ft x 6ft 6in footprint means everyone still gets a workable share of the bed.
- Cooler at scale: The SmarTex surface moves heat away from your body, useful when three bodies or a large dog raise the temperature under one duvet.
- Full 200cm length: The UK super king is 10cm longer than a UK double, which means taller sleepers keep their feet on the mattress rather than off the end.
This size suits you if...
You share the bed every night and want the most space a standard UK size offers, your partner is restless enough that distance matters more than any comfort layer, or children and pets treat your bed as theirs. Your room should allow at least 3m x 2.9m, and a firm feel should suit you both, since the Blackwood offers no softer option in this size.
Consider another size if...
Your bedroom is under our suggested 3m x 2.9m minimum, or a bed this wide would dominate the space. We'd recommend the UK king instead: it's 30cm narrower, the same length, and needs at least 2.7m x 2.9m.
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FAQ's
How much space does each person get on a Sealy Blackwood super king?
Two people sharing get 90cm of width each across the 180cm mattress. That's the same width each sleeper would have on a UK single, which is why the UK super king is the size we point restless couples towards. The firm AlignSupport coils keep each side feeling consistent, so one person's movement carries less across the bed.
How much bigger is a UK super king than a UK king?
The UK super king is 30cm wider than the UK king, and the two are the same length at 200cm. That extra 30cm is roughly a pillow's width of additional space between you, which is often the difference between feeling every turn and sleeping through it. The larger size does need a bigger room: allow at least 3m x 2.9m.
Will the Sealy Blackwood super king fit in my bedroom?
We suggest a room of at least 3m x 2.9m for a UK super king, and that's our guidance rather than Sealy's. Before ordering, check the door swing and any tight landing turns, since a mattress this size is awkward to manoeuvre upstairs. If your room falls short, the UK king needs at least 2.7m x 2.9m.
Is the Sealy Blackwood super king a good choice for a restless partner?
It's one of the better cases for sizing up. With 90cm each, distance does more than any comfort layer could, and the firm coil support means less motion carries across than on a softer bed. One caveat: the Blackwood only comes in a firm feel, so a lightweight side sleeper sharing it may find it a little unforgiving.
Can a family share the Sealy Blackwood in a UK super king?
At 6ft x 6ft 6in, it's the practical size when young children wander in at night or a large dog claims the foot of the bed as routine. The twice-tempered coils are built to cope with extra weight and movement, and the ProShield treatment, endorsed by Allergy UK, is reassuring in a bed pets share.