Firmness
Type
Gel Memory Foam
Depth (cm)
15
Number of Layers
3
Trial Period (nights)
Warranty (years)
5
Price Range
£199 to £299
Best Sleeping Position(s)
Certifications
Assessed from the specification published by MattressNextDay, captured September 2026, and from regular price comparison across our UK retail partners.
If you like a firm feel and want memory foam without the usual heat build-up, this is a reasonable place to start. The cool gel layer offers pressure relief while regulating temperature better than standard memory foam, which means you should sink in less clammily than on older foam designs. The Miratex® base conforms to your body and gives edge to edge support, so you can use the full width of the mattress without that roll-toward-the-middle feeling. At £199 to £299 depending on size, it sits at the affordable end of the market, and the 5-year Silentnight guarantee adds some reassurance at this price. It's one-sided, so no flipping, though you should rotate it head to toe regularly.
Key Features & what's inside
- Soft Touch Quilted Cover. A quilted fabric finish that gives a smooth, breathable sleep surface. It's the first thing you'll feel, and the quilting adds a little softness over the firm foam beneath.
- Cool Gel Memory Foam. This layer provides pressure relief and support, cradling your shoulders and hips as you settle in. The gel infusion regulates body temperature better than standard memory foam, which means less of the overheating foam is known for.
- Supportive Miratex® Foam. Miratex® foam conforms to the shape of your body as you sleep. It provides edge to edge support with no roll together, so you get the full sleeping surface rather than drifting toward the middle.
Layer details from mattressnextday.co.uk product page, September 2026.
Who's it NOT for?
This mattress is described as firm, so lightweight side sleepers may find it a little unforgiving on the shoulders and hips. At 15cm deep it's also slimmer than average, which taller or heavier sleepers may notice. And if you prefer the springy feel of pocket coils, an all-foam design won't give you that.
Silentnight Comfort Gel Memory Foam Mattress
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How firm is the Silentnight Comfort Gel Memory Foam mattress?
It's rated firm. That suits back and front sleepers who want plenty of support, although lightweight side sleepers may find it slightly too solid for comfortable pressure relief at the shoulder and hip.
Does the Silentnight Comfort Gel mattress need turning?
No, it's a one-sided design so it never needs flipping. The retailer listing does note you should rotate it head to toe regularly, which helps the foam wear evenly over time.
How deep is the Silentnight Comfort Gel Memory Foam mattress?
It's 15cm deep, which is slimmer than many mattresses. That makes it a good fit for bunk beds, sofa beds and adjustable bases, but check your fitted sheets, as deep-pocket sheets may sit loosely.
What guarantee comes with the Silentnight Comfort Gel mattress?
It comes with a Silentnight 5-year guarantee, as stated on the mattressnextday.co.uk listing. Mattressnextday also lists free next day delivery to mainland UK and old mattress removal for £39, though those are that retailer's own offers rather than Silentnight's.
What sizes does the Silentnight Comfort Gel mattress come in?
It's available in UK Single, Double and King, priced from £199 to £299 depending on the size you choose. There's no Small Double or Super King listed.
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