Sealy Posturepedic Elevate Blackwood King Size 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
£904
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Sealy Posturepedic Elevate Blackwood Mattress
More available sizes
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
- Room to sleep apart, together: The UK king is 15cm wider than the UK double, which means each of you gets space to shift position without waking the other.
- Firm support at full width: The AlignSupport coil system holds its shape edge to edge, so the extra width of a UK king is all usable sleeping surface rather than a soft perimeter.
- Less disturbance on different schedules: If one of you gets up hours before the other, the responsive coil feel and generous width mean an early alarm is less likely to travel across the bed.
- Length for taller sleepers: At 200cm long, the UK king is 10cm longer than the UK double, a real difference if either of you is approaching six foot.
- Cooler across a bigger surface: The SmarTex surface fabric moves heat away from your body, and two people sharing a UK king generate less trapped warmth than the same pair on a smaller mattress.
This size suits you if...
You share the bed every night and a double has started to feel cramped, especially if one of you is tall enough to appreciate the 200cm length. It also suits couples on mismatched schedules who want firm support and enough width that one person getting up needn't wake the other, or households where the dog claims a corner as routine.
Consider another size if...
Your bedroom falls short of the 2.7m x 2.9m we suggest for a UK king, or you sleep alone. We'd recommend the UK double instead, which needs at least 2.6m x 2.8m of floor space.
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FAQ's
Is a UK king big enough for a couple on the Sealy Blackwood?
Comfortably, for most couples. The UK king measures 150 x 200cm, giving 75cm each for two people sharing, and the firm AlignSupport coil system keeps that width supportive right across the surface. If you both sprawl, or a pet regularly joins you, the UK super king adds 30cm of width.
Will the Sealy Blackwood UK king fit in my bedroom?
We suggest a room of at least 2.7m x 2.9m for a UK king, which leaves space to walk round the bed and open drawers. New build master bedrooms can feel tighter than the plans suggest once wardrobes go in, so measure the usable floor, not the room outline, before ordering.
Is the Sealy Blackwood king good for tall sleepers?
Yes, and length is often the overlooked reason to choose it. The UK king is 200cm long, 10cm longer than the UK double, so anyone approaching or over six foot gains genuine foot room. The BasePlank foundation supports the mattress corner to corner, so that extra length stays firm rather than sagging.
Does a king size reduce partner disturbance?
It helps considerably. The UK king is 15cm wider than the UK double, so movement on one side has further to travel, and the Blackwood's coil construction is responsive rather than bouncy. If your schedules differ by hours and disturbance is your main worry, the UK super king goes further still at 30cm wider.
Should I choose the Blackwood in a UK king or super king?
The UK king suits most couples: plenty of shared space without demanding a large room. The UK super king is 30cm wider and the same length, but we suggest at least 3m x 2.9m of bedroom for it. Compare the retailers listed on this page for both sizes, as prices are updated as retailers change them.