Sealy PosturePedic Merivale Combination 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
£1,599
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The Sealy PosturePedic Merivale Combination Mattress is a handmade, 33cm deep mattress with a cooling graphite foam layer, plant-based comfort foam and AlignSupport coils. It's rated medium firm, so it suits sleepers who like a fairly supportive feel with some cushioning. It comes in a UK single, UK double, UK king and UK super king. Dreams offers a 100-night trial, and Sealy gives a 7-year guarantee.
Mattress specifications
Firmness
Medium Firm
Type
Depth (cm)
33
Number of Layers
5
Trial Period (nights)
Warranty (years)
Price Range
£1,599 to £2,999
Best Sleeping Position(s)
Back Sleeping
Combination Sleeping
Stomach Sleeping
Certifications
Allergy UK
Assessed from the specification published by crushedvelvetbedstore.co.uk, captured October 2026, and from regular price comparison across our UK retail partners.
Why should you choose this mattress?
The graphite foam is designed to draw heat away from your body, which helps if you tend to wake up warm. Beneath it, a plant-based foam targets pressure relief at the hips and lower back, while the AlignSupport coils give responsive support underneath. The UniCased edge system should make the sides more dependable for sitting on or sleeping near. The cover is hypoallergenic and endorsed by Allergy UK, which is useful if allergies bother you. It suits most back and combination sleepers, although lighter side sleepers may find a medium-firm feel a little unyielding.
Key features & 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.
Best suited for?
Back sleepers
The medium firm feel and AlignSupport coils give responsive support underneath, so your body stays held steady while the foam layer cushions the hips.
Combination sleepers
Responsive AlignSupport coils mean the mattress moves with you, which makes changing position during the night feel easy on a medium firm surface.
Warm sleepers
The INFUSE Black Diamond Graphite foam layer draws heat away from the body, which helps you stay more comfortable if you tend to wake up warm.
Allergy sufferers
The hypoallergenic cover is endorsed by Allergy UK, which gives you a sleep surface designed with allergy concerns in mind.
If you prefer sleeping on a soft mattress, this might not be the best choice. It's rated medium firm, so the feel is supportive rather than plush, and lighter side sleepers may want more give around the shoulders. It can't be flipped either, so you're limited to rotating it. Sealy doesn't publish a spring count for this mattress.
Save on an earlier or ex-display model
Some retailers still sell the earlier version of this mattress, or ex-display and returned stock at a lower price. These are the sizes where it costs less than the current model's best price.
Sealy PosturePedic Merivale Combination Mattress
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FAQ's
How firm is the Sealy PosturePedic Merivale Combination Mattress?
It's rated medium firm, so expect a supportive feel with some cushioning on top. That suits most back and combination sleepers, though lighter side sleepers may find it a little firm.
What sizes does the Sealy PosturePedic Merivale Combination Mattress come in?
It comes in a UK single, UK double, UK king and UK super king. The UK king measures 150 x 200cm and the UK super king 180 x 200cm.
How deep is the Sealy PosturePedic Merivale Combination Mattress?
Sealy's product page gives a depth of 33cm. That's enough room for the cooling, comfort and coil layers, and it's worth checking your bed frame and sheets will suit it.
Is the Sealy PosturePedic Merivale Combination Mattress good for hot sleepers?
It's a sensible pick for warm sleepers, as it has a graphite foam layer that draws heat away from the body and a surface designed to feel fresh. Individual comfort still varies from person to person.
Does the Sealy PosturePedic Merivale Combination Mattress come with a trial or guarantee?
Dreams offers a 100-night trial, which is the retailer's own offer, and Sealy gives a 7-year guarantee. Check the terms with the retailer before you buy.
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