Silentnight Memory 1400 Pocket Mattress
Mattress
Silentnight Memory 1400 Pocket Mattress
Size
Firmness
Construction
Depth (cm)
25
Layers
2
Layer Details
- Memory Foam. A memory foam layer that moulds to your body, which means pressure is eased from muscles and joints as you settle in. Expect a gentle cradle rather than a deep sink, given the firm overall feel.
- Mirapocket Springs. 1400 Mirapocket springs sit beneath the foam, each responding independently to your movement. In practice that means targeted support along your spine and less motion transfer across the bed.
Layer details from silentnight.co.uk product page, September 2026.
- 90cm each, every night: Two people sharing get 90cm each, which means you can both stretch out without negotiating the middle of the bed.
- Distance plus pocket springs: The 1400 Mirapocket springs respond individually, and at this width your partner's tossing happens far enough away that little of it reaches you.
- Room for visitors: Children wandering in at 3am, or a large dog who considers the bed shared territory, can squeeze in without pushing either adult to the edge.
- Firm support across the full width: The firm feel and memory foam top stay consistent from edge to edge, so neither sleeper ends up on a softer or saggier patch.
- Suits larger master bedrooms: In a period property or generous new build master, a UK king can look undersized; the UK super king fills the space in proportion.
This size suits you if...
You share the bed every night and want the maximum space a standard UK size allows, your partner is genuinely restless and the extra distance matters more than any comfort layer, or your household routinely includes children or pets in the bed and everyone still needs their share. A bedroom of at least 3m x 2.9m helps, with around 3.5m x 3.2m feeling comfortable.
Consider another size if...
Your bedroom falls short of the 3m x 2.9m we suggest as a minimum, or you'd struggle to get a 180cm-wide mattress up your stairs. We'd recommend the UK king instead: it's 30cm narrower, the same length, and we suggest at least 2.7m x 2.9m for it.
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Is the Silentnight Memory 1400 super king good for restless couples?
It's a strong match. The 1400 Mirapocket springs move independently, so a fidgeting partner sends less motion across the bed, and the UK super king adds 90cm of space each on top of that. Distance plus independent springs is about as undisturbed as a shared bed gets, although very lightweight side sleepers may still find the firm feel a little solid.
Will a super king Silentnight Memory 1400 fit in my bedroom?
The mattress measures 180 x 200cm, and we suggest a room of at least 3m x 2.9m, with around 3.5m x 3.2m feeling right once you add walking space and storage. Check door swing and any tight landing turns too; a 180cm-wide mattress is the awkward part of the move, not the room itself.
Should I choose the UK king or the UK super king in this mattress?
The UK super king is 30cm wider than the UK king, and the two are the same length. If you share with a restless partner, or children and pets join you regularly, that extra 30cm is the difference worth paying for. If your room is under 3m x 2.9m, the UK king is the sensible pick; we suggest at least 2.7m x 2.9m for it.
Does the super king cost much more than smaller sizes?
The price gap between sizes shifts as retailers run offers, so we don't quote figures here. The prices shown on this page are updated as retailers change them, so compare the retailers listed to see the current gap. Do budget for bedding too: super king sheets and a 260 x 220cm duvet cost more than their king equivalents.
Is the super king Silentnight Memory 1400 the same as two singles?
In width, yes: at 180cm it matches two 90cm UK singles side by side, and it's 10cm longer than the UK single's 190cm. Unlike zip and link pairs, though, it's one solid mattress, so there's no join down the middle but also no option to split it for moving upstairs.