Silentnight Miracoil Memory Cushion Top Mattress
Mattress
Silentnight Miracoil Memory Cushion Top Mattress
Size
Firmness
Medium Firm
Construction
Depth (cm)
24
Layers
3
Layer Details
- Cushion Top. A deep-filled cushion top stuffed with extra soft fillings, which means a gentler first impression when you lie down. It softens the surface without changing the firm support beneath.
- Eco Comfort Layer. Silentnight's Eco Comfort layer uses fibres partially made from recycled plastic, including bottles. It's breathable and helps regulate temperature and reduce moisture build-up, so you should feel a little less clammy on warm nights.
- Miracoil Spring System. Silentnight's exclusive Miracoil spring system provides zoned support, which means firmer reinforcement where your body carries more weight. It also supports you right to the edge of the mattress, so you can use the full sleep surface without feeling you'll fall off.
Layer details from silentnight.co.uk product page, September 2026.
- 90cm each, every night: Two people get 90cm of width apiece, which means a fidgety partner can turn over all night without you feeling a thing.
- Room for night-time visitors: When a child pads in at 3am, or the dog treats the bed as routine, a super king means everyone still gets a workable share.
- Edge support you'll actually use: The Miracoil springs support you right to the edge, so even at 180cm wide none of that width goes to waste.
- Firm feel suits a shared bed: The firm zoned base keeps the surface stable across its full width, which means less motion travelling between two well-separated sleepers.
- Fits the room it deserves: At 6ft x 6ft 6in it needs space: we suggest a bedroom of at least 3m x 2.9m so you can still walk round it.
This size suits you if...
You share the bed every night and want distance from a restless partner rather than hoping a comfort layer will mask the movement, or children and pets regularly join you and a UK king has started to feel crowded. It also makes sense if you have a large master bedroom where a smaller bed would look lost, provided you're happy with a firm, supportive feel rather than a soft one.
Consider another size if...
Your bedroom is smaller than the 3m x 2.9m we suggest as a minimum for a UK super king. 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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Will a super king mattress fit in my bedroom?
The Silentnight Miracoil Memory Cushion Top in a UK super king measures 180 x 200cm, and we suggest a room of at least 3m x 2.9m so you can open drawers and walk round the bed comfortably. Measure your door swing and landing turns too, as this size is the one that catches people out.
Is the Silentnight Miracoil Memory Cushion Top super king good for couples?
Yes, arguably the best size of the range for couples. You get 90cm each for two people sharing, and the Miracoil springs support you right to the edge, so neither of you loses usable width. The firm feel keeps the surface stable, which helps if one of you moves around a lot.
How much bigger is a super king than a king in this mattress?
The UK super king is 30cm wider than the UK king, and the two are the same length. That extra width is entirely sleeping space, which is why couples who share with children or a large dog tend to feel the difference immediately. The trade-off is room size: allow at least 3m x 2.9m.
How heavy is the Silentnight Miracoil Memory Cushion Top in a super king?
Silentnight doesn't publish a weight for this size. As a sprung hybrid at 180cm wide it will need two people to move, and it won't fold or roll once unboxed, so check your staircase and any tight landing turns before it arrives.
Where can I buy the Silentnight Miracoil Memory Cushion Top in a super king?
Compare the retailers listed on this page. Prices for the UK super king are live data and updated as retailers change them, so what you see here reflects the current market rather than a snapshot. Availability in the largest size can shift, so it's worth checking back if your preferred retailer is out of stock.