Silentnight Miracoil Sleep Mattress
Mattress
Silentnight Miracoil Sleep Mattress
Size
Firmness
Medium Firm
Construction
Depth (cm)
Layers
Layer Details
- 90cm of width each: Two people sharing get 90cm apiece, which means a partner who turns all night is far enough away that you barely feel it.
- Room for the whole household: When children pad through at night or a dog treats the bed as theirs, the 180cm width means everyone still gets a workable share.
- Supportive feel across a big surface: The Miracoil spring system gives a medium firm, slightly firmer feel, so the mattress stays supportive right to the edges rather than sagging in the middle of all that space.
- Affordable route to maximum size: Super kings from premium brands get expensive quickly; this one keeps a well-known British name within reach at the largest standard UK size.
- Full 200cm length: At 6ft 6in long it comfortably takes taller sleepers, with 10cm more legroom than the UK double or UK single.
This size suits you if...
You share the bed every night and want real distance from a restless partner, or your household includes young children or pets who join you often enough that a UK king feels crowded. It also makes sense if you have a large master bedroom, perhaps in a period property or a new build with a generous main room, where a smaller bed would look lost against the wall.
Consider another size if...
Your bedroom is smaller than the 3m x 2.9m we suggest as a minimum, or you sleep alone. The UK king would suit you better: it's the same 200cm length, 30cm narrower, and needs a room of at least 2.7m x 2.9m.
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Will a super king Silentnight Miracoil fit in my bedroom?
The mattress measures 180 x 200cm, or 6ft x 6ft 6in. We suggest a room of at least 3m x 2.9m so you can walk around it and open drawers, and something nearer 3.5m x 3.2m feels more comfortable. Measure door swing and any landing turns too, as a one-piece super king is awkward on tight stairs.
Is the super king worth it over the king for this mattress?
If two of you share and one is a restless sleeper, yes. The UK super king is 30cm wider than the UK king at the same length, and that extra width does more for undisturbed sleep than any comfort layer. If your room is under 3m x 2.9m, the UK king is the sensible pick.
Is a super king Miracoil big enough for a family sharing?
It's the largest size stocked as standard in the UK, so it's your best option. With 180cm of width, two adults and a visiting child can usually all find space, and the medium firm Miracoil springs hold up well under the extra, unevenly placed weight. It won't feel roomy every night, but nothing bigger is easily available.
How much do two people get each on a super king?
90cm each for two people sharing, which is the same width as a UK single per person. In practice that means you can both turn over, stretch out and sleep in your own space without touching, something the UK double in particular can't offer a couple.
Where can I buy the Silentnight Miracoil Sleep Mattress in a super king?
Compare the retailers listed on this page; the prices shown here are updated as retailers change them. Silentnight is widely stocked in the UK, but availability of the super king specifically varies, so the live table is the quickest way to see who has it now.