Silentnight 3 Zone Memory Foam Mattress
Mattress
Silentnight 3 Zone Memory Foam Mattress
Size
Firmness
Construction
Depth (cm)
18
Layers
2
Layer Details
- Soft Knitted Sleep Surface. A soft, breathable knitted cover that adds a touch of comfort at the surface. It takes a little of the edge off the firm feel beneath.
- Memory Foam. Body-moulding memory foam that responds to your shape, which means pressure points at the hips and shoulders get some relief. Expect a contouring, cradled feel rather than bounce.
Layer details from mattressnextday.co.uk product page, September 2026.
- A sensible depth for raised frames: At 18cm, it sits low enough for bunk beds, cabin beds and mid sleepers, where a taller mattress can leave the safety rail too shallow.
- Firm support for growing sleepers: The firm feel gives children and teens a stable, supportive surface, with the knitted cover softening that first impression slightly.
- Leaves room to live around it: At 90cm wide, it frees up floor space for a desk, wardrobe or toy storage in a bedroom where the bed has competition.
- Fits two in one room: Siblings sharing, or a guest room set up with two beds, works comfortably with this footprint where a wider size would swallow the walkway.
- Memory foam cushioning where it counts: The body-moulding foam eases pressure at the hips and shoulders, which means a firm mattress that still cradles rather than pushes back.
This size suits you if...
You're buying for a child's or teenager's room, especially a bunk or mid sleeper where the 18cm depth keeps the safety rail useful. It also suits a spare room that doubles as an office, or a student flat where the frame came with the tenancy and the mattress didn't, and you want firm support without spending much.
Consider another size if...
You're an adult sleeping alone who wants space to spread out, or you share the bed even occasionally. We'd recommend the UK double instead, and suggest allowing at least 2.6m x 2.8m of floor space for it.
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Will the Silentnight 3 Zone Memory Foam Mattress in a UK single fit a bunk bed?
Yes, and it's one of the better candidates for one. At 18cm deep, it sits lower than many mattresses, so the safety rail on a bunk, cabin or mid sleeper stays high enough above the sleep surface. Check your frame's maximum mattress depth before buying, but 18cm clears most raised frames comfortably.
Is the UK single Silentnight 3 Zone Memory Foam Mattress firm enough for a child?
It's rated firm, which suits growing backs and gives a stable, supportive base for children and teens. The knitted cover and memory foam layer soften the surface a little, so it cushions rather than feels board-like. Very lightweight side sleepers may find the shoulder a touch unforgiving, so consider how your child sleeps.
Should I buy the UK single or the UK small double Silentnight 3 Zone Memory Foam Mattress?
The UK single is 30cm narrower than the UK small double, and both are the same length. For a child, a bunk frame or a tight room, the UK single is the sensible pick. A solo adult who wants more shoulder room could size up, allowing at least 2.4m x 2.8m for the UK small double.
Will the UK single Silentnight 3 Zone Memory Foam Mattress fit a small bedroom?
Almost certainly. We suggest allowing at least 2.1m x 2.8m of floor space, which is smaller than any other size of this mattress needs. That makes it workable in box rooms, loft conversions with a narrow usable footprint, and children's rooms where the bed shares space with a desk and wardrobe.
Is a UK single a good choice for a spare room?
Yes, particularly one that doubles as an office. The 90 x 190cm footprint leaves space for a desk, and the firm feel copes well with occasional guests of different weights. If your spare room hosts couples regularly, the UK double is the better call; allow at least 2.6m x 2.8m for it.