Silentnight Seoul Miracoil Memory Small Double 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
£355
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Silentnight Seoul Miracoil Memory Mattress
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
- Real space for one: The UK small double is 30cm wider than the UK single, which means a solo adult can stretch out, roll over and change position freely.
- Fits a compact room: It's 15cm narrower than the UK double, so it suits box rooms, studio flats and loft conversions where every centimetre of floor space matters.
- Firm support edge to edge: The Miracoil spring system spreads support across the full 120cm width, so a solo sleeper can use the whole surface rather than just the middle.
- Handles occasional couple stays: Two adults can share for the odd night, and the firm feel keeps motion transfer low, which makes it a sensible guest room choice.
- Easy to dress: The 4ft small double is a standard UK size, so frames, fitted sheets and mattress protectors are widely available.
This size suits you if...
You sleep alone and have outgrown a single but your room can't take a full double, you're furnishing a guest room or holiday let where couples stay occasionally rather than nightly, or you're setting up a teenager's room and want them to have grown-up space without losing the floor. Allow at least 2.4m x 2.8m of room for this size.
Consider another size if...
You share the bed every night and want proper space each, or your room is smaller than our suggested 2.4m x 2.8m minimum. Nightly couples should consider the UK super king, allowing at least 3m x 2.9m; for tighter rooms, we'd recommend the UK single instead.
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FAQ's
Is a small double big enough for one adult to sleep on every night?
Comfortably, yes. The UK small double is 30cm wider than the UK single, which means a solo adult gets real room to spread out, and the Miracoil springs in the Seoul support you right across that width. It's a popular upgrade for anyone who has outgrown a single but can't fit a full double.
Can a couple share the Silentnight Seoul in a small double?
For occasional nights, yes, which is why it suits guest rooms and holiday lets. At 120cm wide it's a squeeze for nightly sharing, though, and the firm feel means neither of you will roll into the middle. Couples sharing every night would be happier in the UK super king, if the room allows.
What room size do I need for a small double mattress?
We suggest allowing at least 2.4m x 2.8m. That leaves enough space to walk round the bed and open drawers or a wardrobe. The small double's 120cm width is often what decides whether a box room or loft conversion can take a proper adult bed, so measure carefully before you order.
Does the Seoul come in a standard double if the small double is too small?
No. This mattress is currently listed in UK single, UK small double and UK super king only. If you need more width, the UK super king is 60cm wider and 10cm longer than the UK small double, and we suggest a room of at least 3m x 2.9m for it.
What bed frame and bedding fit the small double Seoul?
You'll need a 4ft small double frame; a standard double frame is 15cm wider, so the mattress would slide about. For bedding, use small double fitted sheets with a standard double duvet, both of which are easy to find since 4ft is a standard UK size.