Silentnight UltraGel Miracoil Pillowtop Mattress
Mattress
Silentnight UltraGel Miracoil Pillowtop Mattress
Size
Firmness
Construction
Depth (cm)
29
Layers
2
Layer Details
- UltraGel™ comfort layer. A gel infused layer that sits at the top and responds to your movements, which means cushioning that adapts as you shift position. Silentnight describes it as offering supreme comfort with strong pressure relief, so it should ease strain around hips and shoulders.
- Miracoil® springs. This spring system runs from head to toe rather than side to side, which is designed to keep your spine aligned through the night. It also helps prevent partner disturbance, so movement on one side of the bed transfers less to the other.
Layer details from silentnight.co.uk product page, September 2026.
- A full 90cm each: Two sharers each get 90cm of width, the same as a UK single apiece, so you can spread out without touching.
- Distance from a restless partner: Extra width puts space between you, and Miracoil springs running head to toe mean movement on one side carries less to the other.
- Room for late night visitors: When a small child or the dog climbs in, the UK super king still leaves both adults a reasonable strip of mattress rather than a sliver.
- 30cm wider than a UK king: You gain 30cm of width over the UK king at the same 200cm length, so the extra space goes sideways, where sharers feel it most.
- Suits a large master bedroom: In a generous room or a high ceilinged period bedroom, a 6ft wide bed sits in proportion where a smaller size can look lost.
This size suits you if...
You share with a partner who tosses and turns and you want genuine distance between you, or children and pets regularly find their way into your bed, and your bedroom comfortably clears our suggested minimum of 3m x 2.9m.
Consider another size if...
Your bedroom is smaller than 3m x 2.9m, or a 6ft wide bed would leave no room to walk around it. We'd recommend the UK king instead, which needs at least 2.7m x 2.9m.
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Is the Silentnight UltraGel Miracoil super king big enough for two adults and a child?
For occasional visits, yes. Two adults start with 90cm each, which leaves a usable gap in the middle when a small child wanders in during the night. It gets tighter as children grow, and a nightly arrangement with an older child will feel cramped on any mainstream size. For young children now and then, the UK super king copes well.
Silentnight UltraGel Miracoil super king or king: which should I buy?
The UK super king is 30cm wider than the UK king and the same length, which gives each sharer 15cm more. If a restless partner or visiting children are the problem, that width helps. If your room is under our suggested 3m x 2.9m, the UK king, at a minimum of 2.7m x 2.9m, is the more comfortable fit.
Will I feel my partner moving on a UK super king Miracoil Pillowtop?
Much less than on a narrower bed. With 90cm each, a partner who shifts about is further away to begin with, and the Miracoil springs run head to toe, which Silentnight designs to reduce movement passing across the mattress. Width does more than any comfort layer here, and the UK super king gives you the most of it.
Can a UK super king fit in a loft conversion bedroom?
Sometimes, but the sloping ceiling usually decides it. At 180 x 200cm, the bed needs a wall with full head height behind it and enough standing room on both sides to get in and out. Measure the floor area where you can stand upright, rather than the whole room, against our suggested 3m x 2.9m before ordering.
Is a super king worth it if the dog sleeps on the bed?
If a large dog joins you every night, the UK super king is the size that leaves both of you a proper share. At 6ft x 6ft 6in, there is room for a dog at the foot or between you without anyone ending up on the edge. Check the door swing and landing turns first, because a mattress this size is awkward to manoeuvre.