Sealy Posturepedic Elevate Holst 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
£788
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The Sealy Posturepedic Elevate Holst is handcrafted in the UK, approved by Allergy UK, and available in four sizes from UK Single to UK Super King. Inside, Reflex Foam comfort layers sit over Sealy's AlignSupport coil spring system, which means you get foam softness on top with sprung support underneath rather than an all-foam feel. Mattress Online lists a 100-night trial and free delivery to most locations, though those are the retailer's own terms rather than Sealy's.
Mattress specifications
Firmness
Medium Firm
Type
Foam
Depth (cm)
30
Number of Layers
3
Trial Period (nights)
100
Warranty (years)
7
Price Range
£788 to £1,294
Best Sleeping Position(s)
Back Sleeping
Stomach Sleeping
Combination Sleeping
Certifications
BS 7177, Allergy UK
Assessed from the specification published by Mattress Online, captured September 2026, and from regular price comparison across our UK retail partners.
Why should you choose this mattress?
This one suits you if you want a supportive, medium feel with a bit of engineering behind it. The ComfortCore™ filling targets the lower back, which means extra reinforcement where most of your weight sits, while the AlignSupport springs are designed to sense and respond to body weight to keep your spine aligned. The springs are twice tempered, a heat treatment that helps them keep their shape over time. Owner feedback on the Mattress Online listing praises the edge support, so you can use the full width of the bed without feeling like you'll roll off. Yes, it's a real spend, but the 7-year guarantee and Allergy UK approval offer some reassurance.
Key features & 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.
Best suited for?
Allergy sufferers
Approved by Allergy UK and finished with a ProShield® fibre cover, it gives you a hygiene-focused sleep surface that suits sensitive sleepers.
Back sleepers
The medium firm feel and ComfortCore™ filling add extra reinforcement under the hips, which means your lower back stays supported while you lie flat.
Couples
Owners praise the edge support, so you can use the full width of the bed without feeling like you'll roll off.
Heavier sleepers
AlignSupport coil springs sense and respond to body weight, which means firm, sprung support underneath rather than an all-foam feel.
Combination sleepers
Reflex Foam over responsive springs gives a supportive medium firm surface, which means changing position through the night should feel easy and steady.
If you love a soft, sink-in feel, this probably isn't your mattress: owners describe it as firm but comfortable, and the medium rating sits at the supportive end. Budget shoppers may also be put off by the starting price when simpler foam options cost less.
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 Elevate Holst Mattress
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FAQ's
Is the Sealy Posturepedic Elevate Holst firm or medium?
The Mattress Online product page rates it as medium, although some owners in reviews describe it as firm but comfortable. If you're a lightweight side sleeper who prefers a plush surface, it may feel a little firmer than you'd like.
How much does the Sealy Elevate Holst mattress cost?
It depends on the size you choose, and the price table on this page shows the current price for each size. Sizes go from UK Single up to UK Super King.
Does the Sealy Elevate Holst come with a trial period?
Mattress Online lists a 100-night trial on this mattress. That's the retailer's own offer rather than a Sealy guarantee, so if you buy elsewhere, check that seller's terms before ordering.
What guarantee does the Sealy Elevate Holst have?
The Mattress Online listing states a 7-year guarantee, and retailer feeds show the same 7-year cover. As with any guarantee, confirm the terms with your chosen retailer at the point of purchase.
How deep is the Sealy Posturepedic Elevate Holst?
It's 30cm deep, so check your fitted sheets will stretch to a deeper mattress. That depth comes from the combination of Reflex Foam comfort layers sitting above the coil spring support system.
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