Silentnight Memory Cool 1000 Super King Mattress
The Silentnight Memory Cool 1000 is a hybrid mattress that pairs 1000 Mirapocket springs with a graphite-infused Memory Cool foam layer, which means you get the contouring feel of memory foam without as much of the heat it usually traps.
- Graphite foam draws heat away
- Minimises partner disturbance
- 60-night trial & 5-year guarantee
£879
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Silentnight Memory Cool 1000 Mattress
More available sizes
Mattress details
Mattress
Silentnight Memory Cool 1000 Mattress
Size
Firmness
Medium Firm
Construction
Foam
Pocket Spring
Hybrid
Memory Foam
Depth (cm)
29
Layers
2
Layer Details
Memory Cool™
A graphite-infused memory foam that moulds to your body to relieve pressure while actively moving heat away from you. Silentnight says this creates a sleep environment 15% cooler than standard memory foam, which means less of the clammy feeling memory foam is known for.
Mirapocket® springs
1000 pocket springs, each held in its own fabric pocket so it responds to your movement independently. In practice that means zoned support along your body and less motion transfer across the bed.
Layer details from silentnight.co.uk product page, September 2026.
Key benefits
- 90cm of width each: Two people sharing get 90cm each, which means you can both stretch out without negotiating an invisible centre line every night.
- Distance plus pocket springs: The 1000 individually pocketed springs limit motion transfer, and at this width there is simply more mattress between you and a fidgeting partner.
- Space when children wander in: At 6ft x 6ft 6in there is realistic room for a small visitor at 3am without one adult ending up on the edge.
- Cooler at close quarters: Two bodies, and sometimes a dog, generate heat; the graphite-infused Memory Cool foam is designed to move that warmth away rather than trap it.
- Fills a large master properly: In a big principal bedroom a smaller bed can look lost, and the 180cm width sits in proportion with the room.
This size suits you if...
You share every night and want the most space a standard UK size offers, your children or pets treat the bed as communal territory, or you have a large master bedroom where a UK king would look and feel undersized. We suggest allowing at least 3m x 2.9m of floor space, so measure before you commit.
Consider another size if...
Your bedroom falls short of the 3m x 2.9m we suggest for this size, or you rarely feel cramped in your current bed. We'd recommend the UK king instead: it's 30cm narrower, the same length, and needs at least 2.7m x 2.9m.
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FAQ's
Is a super king too big for a couple?
Not if you value undisturbed sleep. The 180cm width gives you 90cm each, roughly a single bed's worth of space per person, and the 1000 pocket springs in the Memory Cool 1000 respond independently, so movement on one side stays there. If your room comfortably clears 3m x 2.9m, the extra width rarely feels excessive.
Will the Silentnight Memory Cool 1000 super king fit in my bedroom?
The mattress is 180 x 200cm, and we suggest a room of at least 3m x 2.9m so you can still open doors and walk round the bed. Measure door swing and any landing turns too; a mattress this wide is the one that catches people out on the stairs.
Is the super king a good choice if my partner is restless?
It's arguably the best answer this mattress offers. Pocket springs reduce how much movement travels, but width does more: at 90cm each you may simply be too far away to feel a turn. Combined, the two make a restless partner far easier to sleep through than in a UK double or UK king.
Does the Memory Cool 1000 super king work for co-sleeping with children?
It's the most practical size for it. A child climbing in still leaves two adults with usable space, which isn't true of narrower sizes, and the Medium/Firm feel keeps the surface stable rather than sagging toward the heaviest sleeper. Large dogs who share as routine benefit from the same maths.
Where can I buy the Memory Cool 1000 in a UK super king?
Availability shifts, so the most reliable answer is the live price table on this page, which is updated as retailers change their prices and stock. Compare the retailers listed here rather than assuming one seller carries every size; the super king isn't always stocked everywhere the smaller sizes are.