Firmness
Type
Hybrid
Depth (cm)
37
Number of Layers
4
Trial Period (nights)
60
Warranty (years)
5
Price Range
£559 to £1,179
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 here is the combination of cooling and softness. The graphite infused Memory Cool foam moulds to your body to relieve pressure while transferring heat away, which Silentnight says creates a sleep environment 15% cooler than standard memory foam. If you like the cradling feel of memory foam but usually find it too warm, that's the problem this mattress is built to solve. Underneath, 2000 Mirapocket springs respond individually to movement, with a further 1000 mini springs adding zoned support. The box top adds a plush surface layer without the faff of flipping. Yes, it's a softer feel than many hybrids, but that's the point: it's aimed at sleepers who need a little extra give.
Key Features & what's inside
- Memory Cool™ foam. Graphite infused Memory Cool foam moulds to your body, relieving pressure and absorbing energy. It actively transfers heat away from you, which Silentnight says makes it 15% cooler than standard memory foam.
- Mirapocket® springs. 2000 Mirapocket springs sit in individual pockets and respond independently to every movement. In practice that means less disturbance from a partner and support tailored to where your body needs it.
- Mini springs. A layer of 1000 mini springs adds zoned support. These smaller springs fine-tune how the mattress responds under different parts of your body.
- Box top. A sumptuous box top forms the sleep surface. This gives you a plush, cushioned feel from the moment you lie down.
Layer details from silentnight.co.uk product page, September 2026.
Who's it NOT for?
This is a medium soft mattress, so it's not the best match if you prefer a firm, supportive surface or sleep mainly on your front. Heavier sleepers who need more pushback may also find it a little too yielding. And at 37cm deep, it won't suit shallow fitted sheets or low bed frames.
Silentnight Memory Cool 3000 Pocket Box Top Mattress
Is the Silentnight Memory Cool 3000 soft or firm?
Silentnight rates it medium soft, describing it as a little softer than a medium for sleepers who need a little extra give. It's a plush-feeling mattress, so it suits side sleepers and those who like to sink in rather than lie on top of the surface.
How many springs does the Memory Cool 3000 have?
It has 3000 springs in total: 2000 Mirapocket springs held in individual pockets, plus 1000 mini springs that add zoned support. The pocketed design means each spring moves independently, which helps reduce disturbance when a partner moves.
Does the Silentnight Memory Cool 3000 sleep cool?
It's designed to. The top layer uses graphite infused Memory Cool foam, which transfers heat away from the body. Silentnight says this creates a sleep environment 15% cooler than standard memory foam, so it's a sensible pick if you like memory foam but tend to overheat.
How deep is the Memory Cool 3000 Box Top mattress?
It's 37cm deep, and that depth is consistent across all sizes. That's a tall mattress, so it's worth checking that your fitted sheets are deep enough and that the finished bed height works with your frame.
Does the Silentnight Memory Cool 3000 come with a trial?
Yes. Silentnight offers a 60-night trial and a 5-year guarantee, with delivery listed at 14 days. That gives you two months to sleep on it at home and decide whether the medium soft feel suits you.
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