Silentnight Memory Cool 3000 Pckt Box Top Small Double 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
£578
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Silentnight Memory Cool 3000 Pckt Box Top Mattress
More available sizes
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 spread out alone: The UK small double is 30cm wider than the UK single, which means a solo sleeper can stretch, turn and starfish without an elbow off the edge.
- Fits rooms a double cannot: It's 15cm narrower than the UK double, often the difference between a door that clears the bed frame and one that doesn't.
- A gentler surface for one: The medium soft feel gives noticeable give, and with the whole 120cm to yourself you can settle into the box top wherever you like.
- Copes with the odd shared night: The 2000 Mirapocket springs respond to movement individually, so an occasional guest couple can share without every turn travelling across the mattress.
- Standard 4ft bedding: A small double is a standard UK size, so frames and 4ft fitted sheets are easy to find, though check they stretch to the 37cm depth.
This size suits you if...
You sleep alone and have outgrown a single but your room can't spare the floor space a double demands, you're furnishing a box room, loft conversion or small second bedroom where every centimetre of width matters, or you need a guest bed that handles the occasional couple. The softer, cushioned feel suits side sleepers especially, and one person gets the full width to enjoy it.
Consider another size if...
You share the bed every night, because a couple on a UK small double sits closer than most find comfortable long term. We'd recommend the UK double instead, allowing at least 2.6m x 2.8m of room space.
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FAQ's
What room size do I need for the Memory Cool 3000 in a UK small double?
We suggest allowing at least 2.4m x 2.8m. That leaves enough space to walk round the bed and open drawers, though it's our guidance rather than Silentnight's. If your room comfortably exceeds that, it may be worth checking the UK double, which needs at least 2.6m x 2.8m.
Is the small double Memory Cool 3000 big enough for a couple?
For occasional nights, yes: the pocket springs limit how much you feel a partner move, which helps in a guest room. Sharing every night is a squeeze at 120cm wide, and the UK small double is 30cm narrower and 10cm shorter than the UK king, so full-time couples should size up.
How much bigger is the small double than the single in this mattress?
The UK small double is 30cm wider than the UK single, and the two are the same length at 190cm. That extra width is the whole point: a teenager or adult who has outgrown a single gets genuine spreading room without the bed taking over the room.
What fitted sheets fit the Silentnight Memory Cool 3000 small double?
You need small double, or 4ft, fitted sheets, which are a standard UK size and easy to find. The mattress is 37cm deep, so look for extra deep sheets rather than standard ones. A regular double duvet works fine and gives a little overhang on each side.
Should I get the Memory Cool 3000 in a small double or a double?
It comes down to the room. The UK small double is 15cm narrower than the UK double and the same length, so in a box room, studio or loft conversion that saving can keep a walkway clear. If you have at least 2.6m x 2.8m and share regularly, the UK double is the better buy.