Harrison Spinks Ruby 12500 Pocket Small Double Mattress (Medium Feel)
The Harrison Spinks Ruby 12500 is a pocket spring mattress handcrafted in the UK, with 12,500 springs in total across a 29cm deep build.
- Snug feel that shapes around you
- Natural fibres wick away moisture
- Springs adapt as you move
£1,629
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Harrison Spinks Ruby 12500 Pocket Mattress (Medium Feel)
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Mattress details
Mattress
Harrison Spinks Ruby 12500 Pocket Mattress (Medium Feel)
Size
Firmness
Medium
Construction
Pocket Spring
Wool
Natural
Depth (cm)
29
Layers
5
Layer Details
Cover
A damask cover that's soft to the touch. It's the traditional choice for a handcrafted mattress and feels pleasingly plush.
Wool comfort layer
Layers of British wool blended with hemp and flax fibres, which means a sumptuous, plush surface that shapes around your body. Expect snug cosiness rather than a springy top.
Cotton blend comfort layer
A cotton, hemp and flax blend layered throughout the mattress. Cotton is naturally soft and good at wicking away moisture, helpful if you run warm at night.
Mini pocket springs
1,800 mini Posturfil springs adapt with your body as you move through the night. A further 10,000 bouncy mini springs create pockets of airflow for lasting freshness and extra comfort.
Support system
700 Cortec Quad springs, grouped in fours within fabric pockets, give a flexible base of support. The system is made completely glue-free, so it's more easily recyclable at the end of its life.
Layer details from mattressonline.co.uk product page, September 2026.
Key benefits
- Real space for one: At 30cm wider than the UK single, it gives a lone adult room to sprawl on that cushioned, cradling surface without a wider frame dominating the room.
- Fits rooms a double cannot: It's 15cm narrower than the UK double, which can be the difference between a wardrobe door that opens and one that doesn't.
- A premium build in a practical footprint: The 29cm deep, 12,500-spring construction is identical to the larger sizes, so choosing the smaller footprint means no compromise on the mattress itself.
- Breathable for a snug fit room: Wool, cotton, hemp and flax fillings wick moisture and the mini springs create airflow, useful in smaller rooms where warm air tends to linger.
- Easy to dress: 4ft is a standard UK size, so small double fitted sheets are simple to find and a standard double duvet drapes nicely.
This size suits you if...
You sleep alone most nights and have outgrown a single, perhaps a teenager's room where floor space is scarce, or your bedroom, loft conversion or studio simply cannot take a wider bed, and you still want the plush, natural-fill feel of a handcrafted pocket spring mattress rather than a budget compromise. It also suits a guest room where couples stay occasionally rather than nightly.
Consider another size if...
You share the bed every night, since 120cm gets tight for two on a mattress this cushioned. 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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FAQ's
Is the Ruby 12500 small double big enough for a couple?
For occasional nights, yes, which makes it a sensible guest room choice. For every night, two adults will feel the 120cm width, particularly on a soft to medium surface where you both settle into the fillings rather than perching on top. Couples sharing nightly would be happier on the UK double or UK king.
What room size do I need for a small double mattress?
We suggest at least 2.4m x 2.8m for the UK small double, which leaves room to walk round the bed and open drawers. That's our guidance rather than the manufacturer's. If your room comfortably exceeds it, the UK double needs at least 2.6m x 2.8m and may be worth considering.
How much wider is a small double than a single?
The UK small double is 30cm wider than the UK single, and the two are the same length at 190cm. That extra width is the whole point: a solo sleeper gets proper stretching room on the Ruby 12500's wool and cotton comfort layers without stepping up to a full double footprint.
Is the Ruby 12500 in a small double good for a teenager?
It can be, with a caveat. A teenager who has outgrown a single gets useful extra width while the room keeps its floor space. It is a significant spend for a child's room, though, and the soft to medium feel suits someone who likes sinking in rather than lying on a firmer platform.
Where can I buy the Ruby 12500 in a small double?
Compare the retailers listed on this page; the prices shown are updated as retailers change them. Availability for less common sizes can shift, so if the UK small double is temporarily out of stock it's worth checking back, or looking at the UK double if your room allows at least 2.6m x 2.8m.