Sealy PosturePedic Merivale Combination King Size Mattress
The Sealy PosturePedic Merivale Combination Mattress uses INFUSE Black Diamond Graphite foam to draw heat away from the body, which means you should sleep cooler on a medium-firm surface.
- Stays cooler through the night
- Eases pressure at hips & lower back
- Cover endorsed by Allergy UK
£2,399
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Sealy PosturePedic Merivale Combination Mattress
More available sizes
Mattress details
Mattress
Sealy PosturePedic Merivale Combination Mattress
Size
Firmness
Medium Firm
Construction
Foam
Open Coil Spring
Depth (cm)
33
Layers
5
Layer Details
EternityFibre surface
A soft EternityFibre surface that keeps the mattress feeling fresh, so it should feel pleasant to settle onto.
INFUSE Black Diamond Graphite foam
A cooling foam that draws heat away from the body, which helps you stay more comfortable if you sleep warm.
INFUSE Eco ComfortCore foam
A plant-based foam that targets pressure relief at the hips and lower back, so those areas feel cushioned.
AlignSupport Coil system
Patented coils that give deep-down, responsive support, so the mattress moves with you and holds you steady.
BasePlank foundation
A foundation with two layers of durable foam that adds stability and strength to the whole mattress.
Layer details from crushedvelvetbedstore.co.uk product page, October 2026.
Key benefits
- More room each: At 75cm per person you get 7.5cm more each than on a UK double, so you'll brush against each other less often when one of you turns over.
- Length for taller sleepers: The 200cm length is 10cm longer than a UK double, which means a tall partner's heels stay on the mattress instead of hanging off the end.
- Two sides you can use: Sealy's UniCased edge system is designed to keep the sides dependable, which helps when you each sit on your own edge to get dressed or climb out.
- Cooler with two of you: Two bodies give off more warmth, and the graphite foam layer is designed to draw heat away, which helps if either of you tends to wake up warm.
- Fits more master bedrooms: We suggest at least 2.7m x 2.9m for a UK king, against 3m x 2.9m for the UK super king, so it suits rooms where the bigger bed won't fit.
This size suits you if...
You share the bed every night and keep knocking elbows on a UK double, one of you is tall enough to feel the end of a 190cm bed, or you keep different hours and want a little more space between you.
Consider another size if...
Your bedroom is smaller than our suggested 2.7m x 2.9m once wardrobes and bedside tables 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 a UK king Sealy Merivale big enough for two people?
For most couples, yes. A UK king gives you 75cm each, against 67.5cm each on a UK double, so you gain 7.5cm of personal space every night. If one of you sprawls or a dog joins you regularly, the UK super king gives 90cm each, although it needs a larger room.
Is the Sealy Merivale UK king long enough for a tall person?
It's 200cm long, or 6ft 6in, which is 10cm longer than a UK double. That extra length is often the real reason couples move up a size when one partner is tall. The UK super king is the same length, so sizing up beyond a UK king adds width only, not length.
What size room do I need for a Sealy Merivale UK king?
We suggest at least 2.7m x 2.9m. New build master bedrooms can feel smaller than the plans suggest once fitted wardrobes go in, so measure the space that's actually free, including room to walk round both sides, then compare the retailers listed on this page.
Should I get the Sealy Merivale in a UK king or UK super king?
Go by your room and how much space you each want. The UK king gives 15cm less each than the UK super king, but the UK super king needs at least 3m x 2.9m against 2.7m x 2.9m for the UK king. Both are 200cm long, so length won't decide it.
Will a UK king help if my partner and I keep different hours?
The extra width helps. With 75cm each rather than 67.5cm on a UK double, there's more distance between you when one gets up hours before the other. The edge system is designed to give a dependable side for sitting up and getting out, which means less shuffling across the middle in the dark.