Silentnight Double Sided Miracoil Mattress
Mattress
Silentnight Double Sided Miracoil Mattress
Size
Firmness
Construction
Depth (cm)
24
Layers
3
Layer Details
- Cover. A soft knitted cover that is highly breathable, which means less heat trapped at the surface. It feels soft to the touch rather than stiff or papery.
- Comfort Fillings. Air Plus fibres, breathable comfort fibres that encourage airflow through the mattress. In practice that helps keep the sleep surface feeling fresher through the night.
- Support System. Silentnight's Miracoil spring system, a zoned open coil unit designed to support all parts of the body with individual sleeping zones. The no roll-together design means you are less likely to drift into your partner's side.
- Base Note. The mattress is double sided, so you can flip it to even out wear over time. It arrives flat rather than rolled and boxed, which spares the springs any compression.
Layer details from mattressnextday.co.uk product page, September 2026.
- Real space for one: The UK small double is 30cm wider than the UK single, which means a solo sleeper can stretch out without the bed dominating the room.
- Fits where a double will not: At 15cm narrower than the UK double, this size can be the difference between a bedroom door that clears and one that scrapes.
- Zoned support across the full width: The Miracoil springs are zoned into individual sleeping areas, so support stays consistent whether you sleep centred or drift to one edge.
- Less roll-together for occasional sharing: The no roll-together spring design matters more at 120cm wide, where two people sleep closer than on a larger size.
- Flippable in a compact room: The double sided build lets you turn the mattress to even out wear, and a 4ft mattress is easier to manoeuvre in a tight space than anything wider.
This size suits you if...
You sleep alone and have outgrown a UK single but your room cannot take a full double, you're furnishing a guest room or holiday let where couples stay occasionally rather than nightly, or you're downsizing and the bed has to fit the new bedroom rather than the old one. Allow at least 2.4m x 2.8m of floor space and this size sits comfortably.
Consider another size if...
You share the bed every night, because 120cm is a squeeze for two people long term. We'd recommend the UK double instead, which is 15cm wider and the same length; allow at least 2.6m x 2.8m for it.
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Is the Silentnight Miracoil small double big enough for a couple?
For occasional nights, yes. At 120cm wide it gives two people less room than a standard double, but the Miracoil's no roll-together design helps you both stay on your own side. Couples sharing every night would sleep better on the UK double, which is 15cm wider and the same length.
Will the Silentnight Miracoil small double fit in a box room?
Often, yes, and that is the main reason to buy it. The mattress measures 120 x 190cm, and we suggest a room of at least 2.4m x 2.8m so you can still open the door and walk around the bed. Measure the room first, including any alcoves or radiators that eat into the floor.
Is the small double the same length as a single and a double?
Yes. The UK small double, the UK single and the UK double are all the same length, at 190cm for this mattress. The extra length only arrives at the UK king, which is 10cm longer than the UK small double as well as 30cm wider.
Is the small double hard to flip in a small bedroom?
It is manageable. This mattress is double sided and designed to be flipped, and at 4ft wide it is easier to turn in a tight room than a double or king would be. Silentnight doesn't publish a weight for this size, so if lifting is a concern, have a second person help.
What frame do I need for a 4ft mattress?
A small double frame, sized for a 120 x 190cm mattress. It is a standard UK size, so frames and 4ft fitted sheets are easy to find, and many people pair it with a standard double duvet for extra overhang. Don't put this mattress on a 4ft 6in frame, as the 15cm gap will show.