Firmness
Medium Firm
Type
Hybrid
Depth (cm)
28
Number of Layers
2
Trial Period (nights)
60
Warranty (years)
5
Price Range
£445 to £779
Best Sleeping Position(s)
Certifications
Assessed from Silentnight's published specification for this mattress, captured September 2026, and from regular price comparison across our UK retail partners.
The main draw is temperature. Silentnight states the UltraGel comfort layer is 5x more breathable than standard memory foam, which means it should hold noticeably less heat than an all-foam design. If you're a hot sleeper who still wants a cushioned surface, that matters. Underneath, the 1000 Mirapocket springs sit in individual pockets and respond independently to movement, which means less disturbance from a restless partner and support that follows the shape of your spine rather than pushing back evenly. It comes in five UK sizes from Single to Super King, and with four retailers stocking it there's room to shop around on price.
Key Features & what's inside
- UltraGel comfort layer. A gel infused foam layer that responds to your movements, which means you get contouring without the slow, sunken feel some foams have. Silentnight says it's 5x more breathable than standard memory foam, so it should run cooler through the night.
- Mirapocket springs. 1000 Mirapocket springs, each held in its own fabric pocket so they respond independently to your body. In practice that means zoned support, better spinal alignment and less motion transfer across the bed.
Layer details from silentnight.co.uk product page, September 2026.
Who's it NOT for?
Lighter side sleepers may find the Medium/Firm feel a touch too solid on the shoulders and hips. And if you love the deep, cradling hug of traditional memory foam, the more responsive gel layer here won't give you that. Anyone wanting a very deep, hotel-style pillow top should also look elsewhere.
Silentnight UltraGel 1000 pocket Mattress
How firm is the Silentnight UltraGel 1000 mattress?
Silentnight rates it Medium/Firm. That places it on the supportive side of middling, a sensible fit for back sleepers and heavier side sleepers, though lightweight side sleepers may find it slightly firm around the shoulders.
Does the Silentnight UltraGel 1000 sleep hot?
It's designed not to. Silentnight states the gel infused comfort layer is 5x more breathable than standard memory foam, and the pocket spring core allows air to move through the mattress, so it should stay cooler than a typical all-foam design.
How many springs does the Silentnight UltraGel 1000 have?
It contains 1000 Mirapocket springs, each held in an individual pocket. They respond independently to your movements, which means zoned support for your spine and less disturbance when a partner moves.
Does the Silentnight UltraGel 1000 come with a trial and guarantee?
Yes. Silentnight offers a 60-night trial and a 5 year guarantee, with delivery listed at 14 days. If you buy through a retailer it's sensible to check their terms match before ordering.
What sizes does the Silentnight UltraGel 1000 come in?
Five UK sizes: Single, Small Double, Double, King and Super King. Prices range from £445 to £779 depending on the size you choose.
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