Silentnight Memory 7 Sleep Mattress
Mattress
Silentnight Memory 7 Sleep Mattress
Size
Firmness
Construction
Depth (cm)
Layers
2
Layer Details
- Memory foam. A 30mm layer of memory foam sits on top and responds to your natural body heat. In practice this means it softens where you're warmest and moulds to your shape, giving that gentle, hugged-in feel memory foam is known for.
- Miratex foam. Beneath the memory foam, Miratex foam provides support right up to the edge of the mattress, so you can use the full sleeping surface. Its movement absorption also eliminates roll together, which means you and a partner stay on your own sides rather than sinking towards the middle.
Layer details from mattressman.co.uk product page, September 2026.
- Space plus movement absorption: The Miratex foam absorbs a partner's movement, and at 90cm each for two people sharing, most of their tossing happens too far away to notice anyway.
- Room for night-time visitors: When a child pads in at 3am, or a large dog treats your bed as their own, a 180 x 200cm surface means nobody ends up clinging to an edge.
- Edge support you can actually use: Support runs to the very edge of the mattress, which matters more at this size because a super king only pays off if all 6ft of width is sleepable.
- Memory foam cradling for both sleepers: The 30mm memory foam layer moulds to each body independently, so two very different sleepers can share without compromising on how the surface feels.
- No roll together across a wide surface: The Miratex foam eliminates roll together, so you each stay settled on your own side rather than drifting towards the middle of that generous width.
This size suits you if...
You share the bed every night and one of you is a genuinely light or restless sleeper, or your household includes children or pets who regularly join you and a UK king has started to feel crowded. It also suits you if you have a large master bedroom, perhaps in a period property, where a smaller bed would look lost against the proportions of the room.
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 length, 30cm narrower, and we suggest at least 2.7m x 2.9m for it.
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What room size do I need for a super king Silentnight Memory 7 Sleep?
We suggest at least 3m x 2.9m for a UK super king, and that is our guidance rather than Silentnight's. That allows the door to swing clear and space to walk round both sides. Measure your landing turns too: at 6ft x 6ft 6in, this is a large single piece to carry upstairs.
Is the Silentnight Memory 7 Sleep super king big enough for a family sharing?
At 180 x 200cm it is the largest size Silentnight offers in this mattress, and the most forgiving when children or pets end up in the bed. Two adults get 90cm each when sharing, so an extra small body in the middle still leaves everyone a reasonable share of the surface.
Will the memory foam stop me feeling my partner move in a super king?
Two things work in your favour here. The Miratex foam absorbs movement and eliminates roll together, so you stay on your own sides. And with 90cm each for two people sharing, a restless partner is simply further away than in a smaller size. Distance plus absorption is a strong combination for light sleepers.
How much wider is a super king than a king in this mattress?
The UK super king is 30cm wider than the UK King, and both are the same 200cm length. That extra width is roughly what a child or dog occupies, which is why families sharing tend to feel the difference immediately. If your room is tight, we suggest at least 2.7m x 2.9m for the UK King.
Can I use the full width of this mattress right to the edges?
Yes. The Miratex foam supports right up to the edge, so the outer strips of a 180cm width are properly usable for sleeping, or for sitting to get dressed. That matters at this size: without decent edge support, some of the space you paid for effectively goes to waste.