Firmness
Medium Firm
Type
Hybrid
Depth (cm)
28
Number of Layers
4
Trial Period (nights)
100
Warranty (years)
8
Price Range
£819
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.
If you sleep warm, this is where the Gel Fusion earns attention: both the foam and the 2cm latex layer are gel-infused, which means heat should move away from you rather than building up as it can with standard memory foam. The 1600 Posturepocket springs are individually encased in cloth pockets, so each one responds to your body independently, useful if you share a bed and want less disturbance from a restless partner. The medium to firm feel suits most back and combination sleepers, although lightweight side sleepers may find it slightly too firm at the shoulder. It conforms to BS7177: 2008 for fire resistance, and the cover carries a natural probiotic Bio Protect treatment.
Key Features & what's inside
- Knitted cover. A soft, micro-quilted knitted cover infused with Eco Fibre and a 100% natural probiotic Bio Protect treatment, which means the fillings stay secure and the surface feels cosy rather than crunchy. It adds a touch of warmth to the sleep surface.
- Gel Foam. A gel foam layer that is more breathable and cooler than traditional memory foam, which means you get the pressure relief without the heat build-up. It cushions aches and pains as you settle in.
- Latex. A 2cm layer of gel-infused latex that adapts to your body shape, which means comfort that feels tailored rather than one-size-fits-all. Latex is naturally responsive, so it springs back quickly when you change position.
- Pocket Springs. 1600 Posturepocket springs, each encased in its own cloth pocket, which means every spring moves independently and support is distributed to each part of your body. This also helps limit motion transfer across the bed.
Layer details from mattressonline.co.uk product page, September 2026.
Who's it NOT for?
If you prefer a soft, sink-in feel, the medium to firm tension here will likely feel too solid, particularly for lighter side sleepers. It is also currently listed in UK Double only, so anyone needing a Single, King or Super King will need to look elsewhere. Strict budget shoppers may baulk at £819.
Relyon Repose Gel Fusion 1600 Pocket Mattress
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How firm is the Relyon Repose Gel Fusion 1600?
Relyon rates it medium to firm. In practice that means noticeable support with some surface cushioning from the gel foam and latex, a feel that suits most back and front sleepers, although lightweight side sleepers may find it a little too firm.
Does the Relyon Gel Fusion 1600 sleep cool?
It should sleep cooler than a standard memory foam mattress. The gel foam layer is designed to be more breathable than traditional memory foam, and the 2cm latex layer is also gel-infused, so heat has more routes away from your body. Owner feedback on the retailer's page mentions its cooling properties positively.
What guarantee does the Relyon Repose Gel Fusion 1600 come with?
Mattress Online lists it with an 8-year guarantee and a 100-night trial. Bear in mind these are that retailer's terms, so if you buy elsewhere, check what that seller offers before ordering.
What sizes does the Relyon Gel Fusion 1600 come in?
It is currently listed in UK Double only, priced at £819. If you need a different size, this particular model will not suit you as things stand.
How deep is the Relyon Gel Fusion 1600 mattress?
It is 27.5cm deep, which means most standard fitted sheets should still work, though deep-fitted sheets will give a neater fit. The depth comes from its layered build of gel foam, latex and 1600 pocket springs.
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