Harrison Spinks Ruby 12500 Pocket Single 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
£1,249
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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
- A single that doesn't compromise on build: You get the same 12,500 springs and natural fillings as the larger sizes, which means the solo sleeper isn't getting a cut-down version.
- Fits a compact footprint: At 90cm wide, it slots into a loft conversion or box room where only a narrow bed will go, and we suggest just 2.1m x 2.8m of floor space.
- Breathable for a smaller room: Cotton and wool fillings wick moisture, which helps in the smaller, sometimes stuffier rooms a UK single usually ends up in.
- Gentle feel for lighter bodies: The soft to medium surface cradles rather than resists, which tends to suit the lighter sleepers, teens and smaller adults, most likely to be on a single.
- Check depth on raised frames: This mattress is 29cm deep, so measure the guard rail on any bunk, cabin or mid sleeper before committing, as many are designed for shallower mattresses.
This size suits you if...
You're a solo adult sleeper in a compact room, a loft conversion or a first flat and you want natural materials rather than foam. Or you're buying a long-term bed for a teenager and would rather spend once on something built to last than replace a cheaper mattress in a few years. It also suits a spare room that doubles as an office, where the bed sees regular guest use.
Consider another size if...
You share the bed, even occasionally, as 90cm is genuinely one-person territory. For a couple we'd recommend the UK double instead: it's 45cm wider, the same length, and we suggest at least 2.6m x 2.8m of floor space for it.
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FAQ's
Is the Ruby 12500 in a UK single a good choice for a child's bed?
It can be, though with caveats. The soft to medium feel and natural fillings suit lighter bodies well, but this is a premium mattress, and children often outgrow their first bed setup. It makes more sense for an older child or teenager who'll use it for years. For a young child, a cheaper single may be the wiser spend.
Will the Ruby 12500 UK single fit a bunk bed or mid sleeper?
The width and length fit standard UK single frames, but the depth is the thing to check. This mattress is 29cm deep, and many bunk, cabin and mid sleeper frames specify a shallower maximum so the guard rail still sits above the mattress. Measure your frame's stated limit before buying.
How much room do I need for a UK single mattress?
The mattress itself is 90 x 190cm, and we suggest allowing at least 2.1m x 2.8m of floor space so you can walk around it and open drawers or wardrobe doors comfortably. That makes the UK single one of the few sizes that works in a box room or under the slope of a loft conversion.
Is a UK single big enough for an adult?
For one average-sized adult, yes: at 3ft x 6ft 3in it's the standard UK one-person size, and the Ruby 12500's soft to medium surface cradles a solo sleeper well. Taller adults or anyone who spreads out in the night may prefer sizing up. The UK small double is 30cm wider at the same length.
Is the single the cheapest size of the Ruby 12500?
The UK single is the smallest size in the range, so it sits at the lowest end of the pricing, though this is still a premium mattress in every size. Prices change, so compare the retailers listed on this page for the current figure, which is updated as retailers change it.