Silentnight Memory 800 Pocket Mattress
Mattress
Silentnight Memory 800 Pocket Mattress
Size
Firmness
Construction
Depth (cm)
24
Layers
2
Layer Details
- Memory foam. The top layer gently moulds to the contours of your body, which means pressure points like hips and shoulders feel cushioned rather than pressed against the springs. It provides that slow, hugging comfort memory foam is known for.
- Mirapocket springs. Beneath the foam, 800 Mirapocket springs respond independently to your movements, giving zoned support and improved spinal alignment. Because each spring works on its own, motion transfer across the bed is reduced.
Layer details from silentnight.co.uk product page, September 2026.
- Real space for two: At 150 x 200cm you get 75cm each for two people sharing, which means one of you can shift or stretch without the other noticing.
- Springs plus width equals quieter nights: The 800 Mirapocket springs move independently, and in a UK king the extra width puts more distance between you, so early alarms disturb less.
- Length for taller sleepers: The UK king is 10cm longer than the UK double, a difference anyone approaching six foot will feel at their feet.
- Memory foam across a wider surface: The foam layer moulds to each sleeper separately, so a lighter side sleeper and a heavier back sleeper each get their own contouring.
- An affordable route to the popular upgrade: The UK king is the size most couples trade up to, and this mattress reaches it without the spend pricier hybrids demand; compare the retailers listed on this page.
This size suits you if...
You share the bed every night and a double has started to feel cramped, especially if one of you gets up hours before the other and every movement currently wakes the sleeper left behind. It also makes sense if one partner is over six foot, because the 200cm length gives toes room a standard double does not. Your bedroom should offer at least 2.7m x 2.9m, our suggested minimum.
Consider another size if...
Your bedroom falls short of the 2.7m x 2.9m we suggest for a UK king. The UK double would suit you better; it is 15cm narrower and 10cm shorter, and we suggest at least 2.6m x 2.8m for it.
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Will a UK king Silentnight Memory 800 fit in my bedroom?
The mattress measures 150 x 200cm, or 5ft x 6ft 6in. We suggest a room of at least 2.7m x 2.9m so you can walk round the bed and open wardrobe doors. New build master bedrooms often shrink once fitted wardrobes go in, so measure the clear floor space rather than the room on the plan.
How much space does each person get on a king size Memory 800?
The UK king gives 75cm each for two people sharing. Combined with the 800 independent Mirapocket springs, that extra distance means a partner turning over or getting up early is less likely to wake you than on a narrower size.
Is the UK king Silentnight Memory 800 long enough for someone over six foot?
It is 200cm long, which is 10cm longer than the UK double. For a taller sleeper whose feet reach the end of a standard double, that length is often the real reason to size up, with the extra width a bonus.
Should we choose the UK double or the UK king in this mattress?
The UK king is 15cm wider and 10cm longer than the UK double, and for two adults that width difference is felt every night. Choose the UK double only if your room is tight; we suggest at least 2.6m x 2.8m for that size, against 2.7m x 2.9m for the UK king.
Is a king big enough if the dog sleeps on the bed?
Two adults plus a pet who claims a corner will use every bit of the 75cm each this size allows. If that routine is permanent, the UK super king is 30cm wider than the UK king, though we suggest at least 3m x 2.9m of room for it, so check your space first.