Firmness
Type
Hybrid
Depth (cm)
29
Number of Layers
2
Trial Period (nights)
60
Warranty (years)
5
Price Range
£379 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.
This one suits you if you like the contouring feel of memory foam but have been put off by stories of overheating. The graphite infusion is designed to draw heat away from your body, and the pocket spring base underneath adds bounce and airflow that all-foam mattresses lack. The 1000 Mirapocket® springs sit in individual pockets, which means each spring responds to your movement separately, giving zoned support and less disturbance from a partner shifting about. The Medium/Firm feel suits most back and combination sleepers, although lightweight side sleepers may find it a little too firm at the shoulder. The 5-year guarantee is shorter than some brands offer, but at this price it feels fair.
Key Features & what's inside
- Memory Cool™. A graphite-infused memory foam that moulds to your body to relieve pressure, which means less pushback at your hips and shoulders. The graphite actively transfers heat away from you, and Silentnight claims it creates a sleep environment 15% cooler than standard memory foam.
- Mirapocket® springs. 1000 Mirapocket® springs, each held in its own individual pocket so they respond to every movement independently. In practice that means zoned support where you need it and less of the whole-bed wobble you get with open-coil mattresses.
Layer details from silentnight.co.uk product page, September 2026.
Who's it NOT for?
If you sleep on your side and are lightly built, the Medium/Firm feel may not let your shoulder sink in enough. And if you dislike the slow, hugging sensation of memory foam altogether, no amount of cooling technology will change the basic feel. Fans of a springy, traditional surface should look elsewhere.
Silentnight Memory Cool 1000 Pocket Mattress
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Is the Silentnight Memory Cool 1000 Pocket mattress firm or soft?
Silentnight rates it as Medium/Firm. That suits most back and front sleepers, and heavier side sleepers should be fine too. Lightweight side sleepers may find it slightly too firm for comfortable pressure relief at the shoulder.
Does the Silentnight Memory Cool 1000 sleep hot?
It is designed specifically to run cooler than typical memory foam. The graphite-infused Memory Cool™ layer transfers heat away from your body, and Silentnight claims it creates a sleep environment 15% cooler than standard memory foam. The pocket spring base also allows more airflow than an all-foam design.
How deep is the Silentnight Memory Cool 1000 Pocket mattress?
It is 29cm deep. That is a generous depth that works with standard fitted sheets on most sizes, though very shallow sheets may be a snug fit.
Does the Silentnight Memory Cool 1000 come with a trial and guarantee?
Yes. Silentnight offers a 60-night trial, so you can sleep on it at home before committing, plus a 5-year guarantee. Delivery is listed at 14 days.
What sizes does the Silentnight Memory Cool 1000 come in?
Five UK sizes: Single, Small Double, Double, King and Super King. Prices range from £379 to £779 depending on the size you choose.
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