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.
- 90cm each, every night: With 90cm each for two people sharing, neither of you is compromising, which means a plush box top feel without lying in each other's dip.
- Space absorbs restlessness: The pocket springs limit motion transfer, but at this width a fidgety partner is simply further away, and distance settles disturbance better than any comfort layer.
- Room for company: If children wander in during the night, or a large dog treats the bed as routine, a UK super king means everyone still gets a usable share.
- Cooler across a bigger surface: Two adults sharing generate warmth, so the graphite infused Memory Cool foam, which draws heat away from you, has more to do at this size and earns the extra width.
- The largest standard UK size: At 6ft x 6ft 6in this is 30cm wider than the UK king, the biggest size UK retailers stock as standard.
This size suits you if...
You share every night and want space to be the thing that solves disturbance, rather than hoping a comfort layer will. You have a larger master bedroom, perhaps in a period property or a generous new build, where a UK king would look a little lost. Or your household includes children or pets who join you often enough that 180cm of width stops being a luxury.
Consider another size if...
Your bedroom is smaller than the 3m x 2.9m we suggest as a minimum for a UK super king, or you mostly sleep alone. We'd recommend the UK king instead: it's the same length, and we suggest at least 2.7m x 2.9m for it.
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Will a super king Memory Cool 3000 fit in my bedroom?
The mattress is 180 x 200cm, and we suggest a room of at least 3m x 2.9m, with around 3.5m x 3.2m feeling comfortable. Measure with the door swing and wardrobes in mind. In a loft conversion, the slope usually decides which wall the bed can take, so check head height on both sides too.
Can two people share the Memory Cool 3000 super king without disturbing each other?
Yes, and this size is the best case for it. You get 90cm each for two people sharing, and the 2000 Mirapocket springs respond independently to movement, so a partner turning over registers far less. On a medium soft mattress that combination matters: the width does as much work as the springs.
Is the super king worth it over the king for this mattress?
If your room and budget allow, usually yes. The UK super king is 30cm wider than the UK king and the two are the same length, so all the extra space goes into width, which is where sharing couples feel cramped. If your room is under 3m x 2.9m, the UK king is the sensible stop.
Will this mattress get up the stairs to my bedroom?
At 180cm wide and 37cm deep, this is a bulky item, and tight landings or awkward turns can be a genuine problem. Measure your stairwell, any turns and the bedroom door before ordering. Silentnight doesn't publish a boxed delivery size for this mattress, so check with the retailer listed on this page before you commit.
Is this super king the same size as two singles pushed together?
In width, yes: 180cm matches two 90cm UK singles side by side. In length it differs, since the UK super king is 10cm longer than the UK single. Bear in mind this mattress is one solid piece rather than zip and link halves, so both sleepers get the same medium soft feel.