Sealy Posturepedic Elevate Holst Single 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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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
- Fits compact rooms: At 90cm wide, it leaves space for a wardrobe and desk in a child's or teenager's bedroom rather than swallowing the floor.
- Support that grows with a teen: The ComfortCore filling reinforces the lower back, useful for a growing teenager who's getting heavier and needs more than a basic foam single.
- Edge support across a narrow bed: Owner reviews praise the edge support, which matters more on a 90cm mattress where you're never far from the side.
- Guest ready in a spare room: A UK single suits a spare room that doubles as an office, giving guests proper sprung support without dominating your workspace.
- Cheap, easy bedding: Standard single sheets and a 135 x 200cm duvet fit, the most widely stocked and affordable bedding of any UK size.
- Allergy UK approved: The Allergy UK approval and hygiene-treated cover offer reassurance in a child's room, where mattresses tend to stay in use for years.
This size suits you if...
You're buying for one person: a child moving up from a cot bed, a teenager who needs proper lower back support, or an adult in a student room or first flat where the frame is provided but the mattress isn't. It also suits a spare room that works as an office most of the year, since the 90cm width leaves room for a desk.
Consider another size if...
Two people will ever share this bed, or a restless solo sleeper wants room to spread out. We'd recommend the UK double instead, which is 45cm wider and the same length; allow at least 2.6m x 2.8m of floor space for it.
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FAQ's
What size is the Sealy Elevate Holst UK single?
The UK single measures 90 x 190cm, or 3ft x 6ft 3in. That's the standard one-person size in the UK, so standard single sheets and a 135 x 200cm duvet fit without adjustment. We suggest a room of at least 2.1m x 2.8m to leave a comfortable walkway alongside the bed.
Is the Sealy Elevate Holst single suitable for a bunk or mid sleeper frame?
Check your frame's maximum mattress depth first. The Elevate Holst is 30cm deep, which is taller than many bunk and mid sleeper frames allow, since a deep mattress can raise a child above the safety rail. The 90 x 190cm footprint matches standard UK bunk bases, so width and length are fine.
Is a UK single big enough for an adult?
For one adult, yes. At 90cm wide and 190cm long it's the standard solo size, and the edge support praised across owner reviews helps you use the full width. Taller adults should note the UK single is 10cm shorter than the UK king, so anyone well over six foot may prefer a longer size.
Is the Sealy Elevate Holst single a good choice for a child's room?
It fits the space well: the 90cm width leaves floor free for toy storage, a wardrobe and a desk in a typical child's bedroom. The medium firm feel sits at the supportive end, which suits growing bodies, although a younger child used to a soft mattress may find it a little firm at first.
How much narrower is the single than the small double?
The UK single is 30cm narrower than the UK small double, and the two are the same length. If siblings share a room, two UK singles plus a walkway usually work better than one wider bed. For a solo teen wanting extra sprawl, the UK small double needs a room of at least 2.4m x 2.8m.