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.
- A shared bed that leaves the room usable: At 135cm wide, the UK double fits where a UK king would dominate, so a bed, wardrobe and drawers can coexist in an average room.
- 67.5cm each for two people sharing: You each get 67.5cm of width, and the graphite infused Memory Cool foam cradles you within that space rather than rolling you together.
- Pocket springs matter more at this width: With two of you on 135cm, the 2000 Mirapocket springs responding individually means a partner turning over is far less likely to wake you.
- Bedside tables on both sides, usually: Allow at least 2.6m x 2.8m of floor space and most rooms will still take a table each side of the UK double.
- The easiest size to dress: Double sheets and 200 x 200cm duvets are stocked everywhere, though at 37cm deep this mattress needs deep fitted sheets, so check before you buy.
This size suits you if...
You share the bed every night and want a plush, cooler-sleeping hybrid in a room where a UK king would feel cramped, or you sleep alone and want space to spread out, perhaps with a dog or cat claiming a corner. It also suits a guest room that hosts visiting couples: at 4ft 6in x 6ft 3in it sleeps two without taking over a smaller second bedroom.
Consider another size if...
You and your partner both move around at night and keep waking each other, or your room comfortably exceeds 2.7m x 2.9m. In that case we'd recommend the UK king instead, which is 15cm wider and 10cm longer.
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Is the Memory Cool 3000 in a UK double big enough for two adults?
For most couples, yes. You get 67.5cm of width each, and because the 2000 Mirapocket springs respond independently, movement on one side stays largely on that side. If either of you is broad shouldered or a restless sleeper, the UK king adds 15cm of width and 10cm of length and may be the better long-term buy.
What room size do I need for the Memory Cool 3000 UK double?
We suggest at least 2.6m x 2.8m, with around 3m x 3m the comfortable norm. That allows walking space on both sides and, in most rooms, a bedside table each. If you're squeezing it into a first flat alongside a wardrobe and drawers, measure the walkways before you commit rather than after delivery.
Should I get the Memory Cool 3000 in a UK double or a UK king?
The UK double is 15cm narrower and 10cm shorter than the UK king. Choose the UK double if your room is under our suggested 2.7m x 2.9m for the UK king, or if you want the widest choice of bedding at the lowest prices. Choose the UK king if you share nightly and have the floor space to spare.
Will the UK double Memory Cool 3000 get up narrow stairs?
It measures 135 x 190cm and is 37cm deep, so it's a bulkier carry than a slimmer mattress. In older terraces with turning staircases, or new builds with tight landings, measure the awkward points first. A hybrid with 3000 springs won't fold the way an all-foam mattress can, so plan for two people carrying it.
Is the Memory Cool 3000 UK double a good size for sleeping alone?
It's generous for one. At 135cm wide you can spread out, change position freely, and still leave a corner for a pet without ending up on the edge yourself. The medium soft box top feels plusher when you're not sharing, since you can settle wherever the mattress cradles you best. Compare the retailers listed on this page for current prices.