Silentnight Memory Cool 3000 Pckt Box Top King Size Mattress
The Memory Cool 3000 is Silentnight's box top hybrid, pairing graphite-infused Memory Cool foam with 2000 Mirapocket springs and a further 1000 mini springs, 3000 in total.
- Graphite foam draws heat away
- Medium-soft feel for side sleepers
- 60-night trial & 5-year guarantee
£1,059
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Silentnight Memory Cool 3000 Pckt Box Top Mattress
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Mattress details
Mattress
Silentnight Memory Cool 3000 Pckt Box Top Mattress
Size
Firmness
Medium Soft
Construction
Foam
Pocket Spring
Memory Foam
Depth (cm)
37
Layers
4
Layer Details
Memory Cool™ foam
Graphite-infused memory foam that moulds to your body, relieving pressure while drawing heat away from you. Silentnight says it creates a sleep environment 15% cooler than standard memory foam.
Mirapocket® springs
2000 Mirapocket springs sit in individual pockets, each responding to your movement independently. That means zoned support and less disturbance when a partner shifts about.
Mini springs
A layer of 1000 mini springs adds a second level of zoned support beneath the comfort layers.
Box top
A sumptuous box top finish for a plush, cushioned surface the moment you lie down.
Layer details from silentnight.co.uk product page, September 2026.
Key benefits
- Room to sink in without colliding: The medium soft feel and box top invite you to settle deep into the surface, and 75cm each for two people sharing means you can do that without meeting in the middle.
- Springs that work harder in a wider bed: The 2000 Mirapocket springs respond individually, which means one partner getting up hours before the other transfers far less movement across the full 150cm width.
- Length for taller sleepers: At 200cm long, the UK king is 10cm longer than the UK double, which is often the difference between feet on the mattress and feet hanging off it.
- Cooling that suits a shared bed: Two bodies generate more heat than one, so the graphite-infused Memory Cool foam, which Silentnight says runs 15% cooler than standard memory foam, matters more at this size.
- Space for a restless night: If you shift position often, during pregnancy for example, the UK king gives you room to prop pillows and change sides without disturbing whoever is next to you.
This size suits you if...
You share the bed every night and a double has started to feel cramped, especially on a softer mattress where you both settle into the surface. It also suits you if one of you is approaching 6ft and needs the 200cm length, or if you sleep on different schedules and want the pocket springs and extra width to keep early alarms from waking the other.
Consider another size if...
Your bedroom falls short of the 2.7m x 2.9m we suggest for a UK king, or you sleep alone. We'd recommend the UK double instead, which needs a smaller room at around 2.6m x 2.8m.
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FAQ's
Is a UK king big enough for a couple on this mattress?
Yes, comfortably for most. The UK king gives 75cm each for two people sharing, and because the Memory Cool 3000 is medium soft with a plush box top, that width helps you both settle in without rolling towards each other. If you regularly share with a dog or a small child, the UK super king adds another 30cm of width.
Will the Silentnight Memory Cool 3000 in a UK king reduce partner disturbance?
The 2000 Mirapocket springs compress individually rather than as a unit, so movement stays local. Combined with the 150cm width of a UK king, one of you leaving for an early shift is much less likely to wake the other than it would be on a narrower bed.
Is the UK king long enough for someone over 6ft?
Usually, yes. At 200cm (6ft 6in), the UK king is 10cm longer than the UK double, and for taller sleepers that length is often the real reason to upgrade, more so than the width. Anyone well over 6ft still gets the same 200cm in the UK super king, as both sizes share the same length.
What room size do I need for this mattress in a UK king?
We suggest at least 2.7m x 2.9m, and that is our guidance rather than Silentnight's. New build master bedrooms can feel smaller than they look once wardrobes go in, so measure with furniture in place. If it's a squeeze, the UK double is 15cm narrower and needs at least 2.6m x 2.8m.
Should I choose a UK king or a UK super king for the Memory Cool 3000?
The UK king suits most couples: proper personal space without dominating the room. The UK super king is 30cm wider, which helps if a pet shares the bed or you both sprawl, but it needs a room of at least 3m x 2.9m. Both are the same 200cm length, so height isn't a deciding factor.