Sealy Posturepedic Elevate Holst Double Mattress
The Sealy Posturepedic Elevate Holst is a 30cm deep, medium-feel mattress with Reflex Foam comfort layers over Sealy's AlignSupport coil spring system.
- Extra support for your lower back
- Use the full width, no roll-off
- Allergy UK approved
£914
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Sealy Posturepedic Elevate Holst Mattress
More available sizes
Mattress details
Mattress
Sealy Posturepedic Elevate Holst Mattress
Size
Firmness
Medium Firm
Construction
Foam
Depth (cm)
30
Layers
3
Layer Details
Cover
A knitted cover treated with ProShield® fibres and SmarTex™, which means a soft sleep surface with a hygiene-focused finish. One point to know: the retailer listing describes it as quilted in one section and knitted in its specification table, so the exact finish is slightly unclear.
Comfort Layer
Reflex Foam fillings including ComfortCore™, which targets the lower back, and InfiniLux™ foam for long-lasting comfort. In practice, that means cushioning that's a little firmer under your hips than a basic foam layer.
Support System
AlignSupport Coil Springs, Sealy's Posturepedic support system, designed to align the spine by sensing and responding to your body weight. The springs are twice tempered, a process that helps them hold their resilience for longer.
Layer details from mattressonline.co.uk product page, September 2026.
Key benefits
- A shared size that fits most UK bedrooms: At 135 x 190cm, the UK double leaves space for wardrobes and drawers in rooms where the UK king would dominate.
- Edge support that matters more at this width: Owner reviews on the retailer listing praise the edge support, which means two sharers can use the full 135cm rather than drifting to the middle.
- Springs that respond to two different bodies: The AlignSupport coils are designed to sense and respond to body weight, useful when two sleepers of different sizes share 67.5cm each.
- Room for bedside tables on both sides: In a typical 3m x 3m bedroom, the UK double usually leaves enough wall on each side for a small table and lamp.
- Bedding is easy and cheap to find: Double sheets and a 200 x 200cm duvet are stocked everywhere, handy if you're kitting out a first flat or a guest room.
This size suits you if...
You share the bed every night and your room sits around the 2.6m x 2.8m minimum we suggest, or you sleep alone and want space to spread out, perhaps with a dog or cat claiming a corner. It's also a sensible pick for a guest room that hosts visiting couples, since the medium firm feel and reinforced edges suit a range of sleepers you can't predict.
Consider another size if...
You and your partner both like to sprawl and your bedroom can take a bigger bed. The Sealy Elevate Holst in a UK king is 15cm wider and 10cm longer; allow at least 2.7m x 2.9m for it.
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FAQ's
Is the Sealy Elevate Holst in a UK double big enough for a couple?
For most couples, yes. The UK double gives 67.5cm each for two people sharing, and the praised edge support means you can sleep close to the sides without feeling you'll roll off. Restless sleepers, or two broad-shouldered adults, may prefer the UK king, which is 15cm wider and 10cm longer.
What room size do I need for the Sealy Elevate Holst double?
We suggest at least 2.6m x 2.8m, with around 3m x 3m the comfortable norm. That allows bedside tables on both sides and space to open wardrobe doors. These figures are our own guidance rather than Sealy's, so measure your room before ordering, including any alcoves or radiators.
Should I get the Sealy Elevate Holst in a double or a king?
It comes down to your room. The UK double is 15cm narrower and 10cm shorter than the UK king, so it suits rooms near our suggested 2.6m x 2.8m minimum. If you have at least 2.7m x 2.9m and share every night, the extra width of the UK king is usually worth having.
How heavy sleepers does the double version support?
Sealy doesn't publish a weight limit for this mattress, so check the brand's own guidance if you're unsure. The AlignSupport springs are designed to respond to body weight, and the twice tempered coils are heat treated to hold their shape, which helps when two adults use the same 135cm surface nightly.
Will a double mattress fit up narrow stairs in an older terrace?
At 135 x 190cm and 30cm deep, the UK double is easier to manoeuvre than the UK king, but turning stairs in older terraces and tight new build landings can still be awkward. Measure your stairwell and doorways first, and check the delivery terms with whichever retailer you buy from.