Harrison Spinks Platinum 12500 Pocket Mattress (Medium Feel)
Mattress
Harrison Spinks Platinum 12500 Pocket Mattress (Medium Feel)
Size
Firmness
Medium
Construction
Depth (cm)
29
Layers
5
Layer Details
- Comfort layer. Layers of plush British wool sit at the top, which means natural temperature regulation. You should feel cosy in winter and refreshed in summer.
- Comfort layer blend. Cotton and wool fibres are blended with hardwearing hemp and flax. These tougher natural fibres help the comfort layers keep their feel for longer.
- Sustainable layer. A layer of Ecotex fibres, made from recycled materials, completes the comfort section. It adds strength and durability rather than softness.
- Support system. Layers of 10,500 mini springs contour to your body for personalised comfort. An additional 1,000 Posturfil springs respond to your movements and weight distribution.
- Spring system. The base uses 1,000 Cortec Quad Revolution springs, each encased in its own pocket and secured into groups of four. Each of these springs contains a mini spring inside it, adding a second stage of response.
Layer details from mattressonline.co.uk product page, September 2026.
- Real space for one sleeper: At 30cm wider than the UK single, this size lets a solo adult stretch out across the wool comfort layers rather than sleeping in a fixed lane.
- A premium mattress for a compact room: The 120cm width fits box rooms, studio flats and loft conversions where a UK double would leave no walking space, so a smaller room needn't mean a lesser mattress.
- Full contouring at this width: The layered spring system, 12,500 springs in total, adapts to your shape wherever you settle, so a lone sleeper can drift across the full 120cm and feel consistent support.
- Temperature control for a small space: Compact bedrooms can run warm, and the British wool layers regulate heat naturally, which means you should feel cooler on stuffy nights in a snug room.
- Easy to dress and frame: The 4ft small double is a standard UK size, so fitted sheets and bed frames are simple to find, and a standard double duvet works well on top.
This size suits you if...
You sleep alone most nights and have outgrown a UK single but your room can't take a UK double, or you're furnishing a guest room or holiday let where couples stay occasionally rather than nightly. It also suits a downsizer whose new bedroom needs a bed sized for the room you have now, not the one you left. Allow at least 2.4m x 2.8m of floor space.
Consider another size if...
You share the bed with a partner every night, in which case 120cm will feel tight over time. We'd recommend the UK double instead, which is 15cm wider; allow at least 2.6m x 2.8m for it.
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Is a small double big enough for two people every night?
For occasional stays, yes: a couple can share the UK small double comfortably for a weekend visit, which is why it works well in guest rooms. For nightly sharing, 120cm across leaves each of you noticeably less space than a UK double, so we'd suggest sizing up if the room allows.
What room size do I need for the Harrison Spinks Platinum 12500 in a small double?
We suggest allowing at least 2.4m x 2.8m of floor space. That leaves room to walk around the bed and open drawers or wardrobe doors. If your room is smaller than that, measure carefully before ordering, paying particular attention to whether the door still swings clear of the bed.
How much wider is a small double than a single?
The UK small double is 30cm wider than the UK single, and both are the same 190cm length. That extra width is the point of this size: a teenager or adult who has outgrown a single gains real stretching room without the bed swallowing the floor space a UK double would take.
Does the Platinum 12500 feel different in the small double size?
The construction is identical across every size: the same wool, cotton, hemp and flax fillings and the same layered spring system with a medium feel. What changes is how you use it. A solo sleeper on the small double gets the contouring effect across the whole 120cm surface, wherever they settle.
Will small double bedding fit this mattress?
Yes. It takes standard small double, or 4ft, fitted sheets, and because the mattress is 29cm deep it's worth choosing sheets with a deep enough pocket. A standard double duvet sits nicely on top, with a little overhang on each side. Both are widely stocked in the UK.