Firmness
Firm
Type
Open Coil Spring
Depth (cm)
27
Number of Layers
6
Trial Period (nights)
100
Warranty (years)
7
Price Range
£1,027 to £1,775
Best Sleeping Position(s)
Certifications
Assessed from the specification published by Mattress Online, captured September 2026, and from regular price comparison across our UK retail partners.
This mattress suits sleepers who want firm support without sleeping hot. The Geltex layer has an open-cell structure that reduces overheating, while the MemorySense ComfortCore moulds around your body to keep joints and muscles protected. Below that, the twice tempered AlignSupport springs sense and respond to your body weight to keep your spine aligned. It's single-sided, so no flipping, and turning handles make rotation easier. Buying through Mattress Online, you get a 100-night trial and a 7 year guarantee under that retailer's terms, plus free delivery to most locations with a two-hour time slot. Yes, it's an investment, but the construction and certifications give you plenty for the money.
Key Features & what's inside
- Quilted cover. A traditional quilted cover treated with SmarTex and ProShield, which means it helps manage moisture and temperature while offering allergen relief. A sensible top layer if you're prone to sniffles.
- Geltex. A supremely breathable foam with an open-cell structure that reduces overheating. It also has excellent bounce back, so you won't feel stuck in one position.
- MemorySense ComfortCore. A core layer similar to memory foam that moulds around your body. This keeps joints, bones and muscles protected while you sleep.
- Dual firm foam layer. An additional stability layer. It adds to the firm, planted feel of the mattress as a whole.
- AlignSupport Coil Springs. Sealy's Posturepedic spring system, designed to align the spine by sensing and responding to your body weight. The springs are twice tempered, which means they hold their shape and resilience for longer.
- Base plank. A sturdy platform that supplies stable support for all the layers above. It helps avoid the mattress dipping in the middle over time.
Layer details from mattressonline.co.uk product page, September 2026.
Who's it NOT for?
If you prefer a soft, cradling feel, look elsewhere: this is firm, and across owner reviews some found it harder than expected. Lightweight side sleepers may not sink in enough for comfortable shoulder and hip pressure relief. It's single-sided too, so if you like a flippable mattress, this isn't one.
Sealy Posturepedic Elevate Premier Gel Mattress
How firm is the Sealy Posturepedic Elevate Premier Gel mattress?
It's rated firm, and owner feedback suggests it genuinely feels that way. One reviewer found it harder than anticipated even knowing the rating, so treat it as a properly firm mattress rather than a medium-firm.
Does the Sealy Elevate Premier Gel need to be flipped?
No. It's single-sided, so there's no flipping required. Turning handles are included, which makes rotating it or moving it around the bedroom a little easier.
What guarantee comes with the Sealy Elevate Premier Gel?
Mattress Online lists a 7 year guarantee and a 100-night trial. Those are the terms shown on that retailer's listing, so check the terms wherever you buy, as they may differ elsewhere.
Is the Sealy Elevate Premier Gel good for hot sleepers?
It should help. The Geltex layer has an open-cell structure designed to reduce overheating, and the quilted cover is treated for moisture and temperature regulation. It's a spring mattress too, which tends to allow more airflow than all-foam designs.
What sizes does the Sealy Elevate Premier Gel come in?
It's available in UK Single, Double, King and Super King, with prices from £1,027 to £1,775 depending on size. The mattress is 27cm deep across the range.
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