Last seen for £468 at Mattress Online on 2nd September 2026
Silentnight Seoul Miracoil Memory Super King Mattress
The Silentnight Seoul Miracoil Memory is a firm hybrid mattress that pairs Silentnight's Miracoil spring system with a memory foam comfort layer, which means you get sturdy, even support with a little pressure-relieving softness on top.
- Firm support for back & front sleepers
- Memory foam cushions the firmness
- Usable right to the edge
Save with the previous model
Some retailers still sell the earlier version of this mattress for less than the current model's best price.
More available sizes
Last seen for £468 at Mattress Online on 2nd September 2026
Mattress details
Mattress
Silentnight Seoul Miracoil Memory Mattress
Size
Firmness
Firm
Construction
Foam
Hybrid
Memory Foam
Open Coil Spring
Depth (cm)
Layers
2
Layer Details
Memory foam comfort layer
A layer of body-moulding memory foam sits on top of the springs and moulds to your body. It softens the surface of a firm mattress, so you feel cushioned rather than resting on hard springs.
Miracoil spring core
A continuous head-to-toe Miracoil spring system with three support zones forms the base. The zoning gives different parts of your body the support they need, and the continuous coil design carries that support out towards the edges.
Layer details from bedsonlegs.co.uk and linthorpebeds.co.uk product pages, October 2026.
Key benefits
- 90cm each for two sharing: With 90cm each for two people sharing, a fidgety partner is simply further away, which does more for your sleep than any comfort layer could.
- Firm support across the full width: The Miracoil system spreads support across the mattress rather than sagging under the heavier sleeper, so a big shared surface stays stable edge to edge.
- Room for night-time visitors: When a child pads in at 3am, a UK super king means everyone keeps a workable share of the bed rather than someone clinging to the edge.
- Memory foam softens the firm feel: The memory foam layer cushions the firm springs slightly, so the sleeper who ends up on the child's side of the bed still gets some pressure relief.
- A sensible price for the biggest size: Super kings usually carry a steep premium, so a firm hybrid at this size from a familiar British brand is genuinely affordable; compare the retailers listed on this page.
This size suits you if...
You share the bed every night and want the most sleeping space a standard UK size offers, your children or pets regularly join you and a smaller bed leaves someone squeezed out, or one of you is a restless sleeper and distance is the fix. Your room should allow at least 3m x 2.9m, and larger will feel more comfortable to move around in.
Consider another size if...
Your bedroom falls short of the 3m x 2.9m we suggest for a UK super king, or you sleep alone. In this mattress we'd recommend the UK small double instead, which needs a room of at least 2.4m x 2.8m.
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FAQ's
How much space does each person get on the Silentnight Seoul super king?
The UK super king gives 90cm each for two people sharing. On this mattress that space is backed by the Miracoil spring system, which spreads support across the width rather than relying on individual pockets, so each of you gets a consistent, firm feel across your own half rather than rolling towards the middle.
Will the Silentnight Seoul super king fit in my bedroom?
The mattress measures 180 x 200cm, and we suggest a room of at least 3m x 2.9m so you can still open drawers and walk around the bed. Before ordering, check the tighter points too: door swing, landing turns and any awkward stair corners, because a super king is a bulky item to move upstairs.
Is the Silentnight Seoul super king good for restless couples?
Yes, and mostly because of the size itself. With 90cm each, a partner who turns all night is far enough away that you feel much less of it. The firm Miracoil support keeps the surface stable rather than bouncy, which helps too, although lightweight side sleepers may still find the feel a little firm.
How much bigger is the super king than the small double in this mattress?
The UK super king is 60cm wider and 10cm longer than the UK small double, so it is a substantial jump in footprint. The UK small double suits a solo sleeper or a couple in a compact room, while the UK super king is the choice when two people, and sometimes children or pets, share every night.
Is this size worth it if children or pets end up in the bed?
This is where the UK super king makes the strongest case. At 180cm wide, a child or a large dog joining in the night still leaves both adults a reasonable share, where a smaller bed would push someone to the edge. The firm, evenly spread Miracoil support also copes well with weight landing in unpredictable places.