Firmness
Medium Firm
Type
Hybrid
Depth (cm)
32
Number of Layers
5
Trial Period (nights)
100
Warranty (years)
8
Price Range
£835 to £1,215
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.
The main draw is the combination of cooling and support. The gel foam layer is designed to run cooler than traditional memory foam, which matters if you tend to overheat at night, and the latex beneath it adapts to your body shape for pressure relief. Underneath, the two spring layers work together: mini pocket springs fine-tune comfort near the surface while the Posturepocket base handles deeper support. Yes, £835 upwards is a proper spend, but you're getting a 32cm-deep, UK-handcrafted hybrid with an 8 year guarantee listed by the retailer. Mattress Online also lists a 100-night trial and free delivery to most locations, though those are the retailer's own terms rather than Relyon's.
Key Features & what's inside
- Knitted cover. A soft, micro-quilted cover that locks the fillings in place and adds a cosy, warm finish. It's infused with Eco Fibre and a 100% natural probiotic Bio Protect treatment.
- Gel Foam. A breathable layer with 2cm of gel-infused latex, designed to sleep cooler than traditional memory foam. It provides pressure relief, which means less build-up of tension at your hips and shoulders.
- Latex. A plush, adaptive material that responds to your body shape. In practice, this gives a contouring feel without the slow sink of memory foam.
- Mini Pocket Springs. 800 small, individually cased springs that respond to your shape and movements. They add a layer of soothing pressure relief between the comfort foams and the main support unit.
- Pocket Springs. A supportive base of 1,600 Posturepocket springs, each encased in its own cloth pocket. Because they move independently, one sleeper shifting shouldn't disturb the other.
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 rating here will likely feel too solid, particularly for lightweight side sleepers. Anyone needing a size beyond UK Single or UK Double is out of luck for now. And if you sit on the edge of the bed a lot, one owner reported the edge support falls a little short.
Relyon Repose Gel Fusion 2400 Pocket Mattress
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How firm is the Relyon Repose Gel Fusion 2400?
It's rated medium to firm, which suits most back and front sleepers who want clear support with some surface softness from the gel foam and latex layers. Lightweight side sleepers may find it slightly too firm for comfortable pressure relief at the shoulder and hip.
Does the Relyon Repose Gel Fusion 2400 come with a trial?
Mattress Online lists a 100-night trial on this mattress. That's the retailer's own offer rather than a Relyon guarantee, so if you buy elsewhere, check that seller's terms before ordering.
How many springs does the Relyon Repose Gel Fusion 2400 have?
It has 2,400 springs in total: 800 mini pocket springs in the comfort layers and a base of 1,600 Posturepocket springs. Each spring is individually encased, so they respond to your body separately, which helps with motion isolation between partners.
Is the Relyon Repose Gel Fusion 2400 good for hot sleepers?
It should help. The gel foam layer is designed to be more breathable and cooler than traditional memory foam, and the pocket spring layers allow air to move through the mattress. It won't feel as airy as an all-spring mattress, but it's a sensible choice if you run warm.
What guarantee does the Relyon Repose Gel Fusion 2400 have?
Mattress Online lists an 8 year guarantee on this mattress. As that figure comes from a retailer listing rather than Relyon directly, it's worth confirming the guarantee terms with whichever retailer you buy from.
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