Silentnight Memory Cool 3000 Pocket Box Top Mattress
Mattress
Silentnight Memory Cool 3000 Pocket Box Top Mattress
Size
Firmness
Construction
Depth (cm)
37
Layers
4
Layer Details
- 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.
- Room to sleep soft without colliding: A medium soft mattress lets you sink in, and 75cm each for two people sharing means you can do that without ending up in each other's space.
- Pocket springs matter more at this width: The 2000 Mirapocket springs respond individually, so if one of you gets up hours before the other, movement stays on their side of the 150cm width.
- Extra length for taller sleepers: At 200cm long, the UK king is 10cm longer than the UK Double, which is the difference between feet on the mattress and feet off it.
- Cooling that works when you share: Two bodies generate more heat than one, and the graphite infused Memory Cool foam transfers that heat away rather than trapping it.
- A plush surface across the full width: The box top gives the same cushioned feel edge to edge, so neither sleeper is stuck on a lesser patch of mattress.
This size suits you if...
You share the bed every night and a double has started to feel like a compromise, especially if one of you sleeps warm or moves around. It also makes sense if either partner is approaching 6ft, since the 200cm length removes that cramped, feet-at-the-edge feeling. And if a dog has quietly claimed part of the bed, the extra width buys back the space you lost.
Consider another size if...
Your room falls short of the 2.7m x 2.9m we suggest for a UK king, or you sleep alone. The UK double would suit a smaller room better, and we suggest at least 2.6m x 2.8m for the UK Double.
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Is a UK king big enough for a couple on the Memory Cool 3000?
Yes, comfortably for most couples. You get 75cm each for two people sharing, and because this is a medium soft mattress with a box top, you both sink in a little. The extra width over a double means that softness feels indulgent rather than crowded, and the pocket springs keep each sleeper's movement local.
Will the king size Memory Cool 3000 fit in a new build master bedroom?
Often, but measure first. New build masters can feel smaller than the floor plan suggests once fitted wardrobes go in. We suggest at least 2.7m x 2.9m for a UK king, which leaves walking room on both sides. If your room is tighter than that, the UK double is the safer choice, with at least 2.6m x 2.8m suggested.
Is the UK king long enough for someone over 6ft?
At 200cm, or 5ft x 6ft 6in in old money, the UK king is 10cm longer than the UK Double, and that length is often the real reason taller sleepers upgrade. A partner over six foot gets their feet on the mattress rather than hanging off the end, without needing the room a UK super king demands.
Does the Memory Cool 3000 in a king reduce partner disturbance?
Two things help. The 2000 Mirapocket springs sit in individual pockets and respond independently, so an early alarm on one side transmits less across the mattress. And 75cm each for two people sharing means you're less likely to be touching in the first place. If disturbance is your main complaint with a double, this size addresses it directly.
Should I go for the king or the super king in this mattress?
The UK king suits most couples: plenty of space without dominating the room. The UK super king is 30cm wider than the UK king and the same length, so it's about width, and we suggest at least 3m x 2.9m of bedroom for it. Choose it if your room is generous and you want maximum separation; otherwise the UK king is the sensible pick.