Harrison Spinks Ruby 12500 Pocket Mattress (Soft to Medium Feel)
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Mattress
Harrison Spinks Ruby 12500 Pocket Mattress (Soft to Medium Feel)
Size
Firmness
Medium Soft
Construction
Pocket Spring
Wool
Natural
Depth (cm)
29
Layers
6
Layer Details
Damask cover
A damask cover that's soft to the touch. It's the traditional choice for a handcrafted mattress and feels pleasingly plush under a sheet.
Wool comfort layer
Layers of British wool blended with hemp and flax fibres sit directly beneath the cover. Wool regulates temperature naturally, which means it helps you stay warm in winter and cooler in summer.
Cotton, hemp and flax blend
A cotton, hemp and flax blend is layered throughout the mattress. These natural fibres add breathability and a slightly springy, resilient comfort that foam can't quite match.
Cortec Quad springs
700 Cortec Quad springs, with groups of four springs placed within a single fabric pocket. More springs per pocket means finer, more localised support as you change position.
Posturfil springs
1800 mini Posturfil springs designed with flexibility in mind, adapting with your body as you move through the night. In practice that means less resistance when you roll over.
Mini springs
10000 bouncy mini springs create pockets of airflow throughout the mattress. That built-in ventilation helps keep the natural fillings fresh over time and adds a little extra cushioning.
Layer details from mattressonline.co.uk product page, September 2026.
- A natural fit for lighter sleepers: The soft to medium feel favours lighter bodies, which means children, teens and smaller adults sink in just enough to get proper pressure relief at the shoulders and hips.
- Compact footprint, full construction: At 90cm wide, this size leaves floor space free for a desk, wardrobe or toy storage while still carrying every one of the mattress's spring layers.
- Breathable for warm little sleepers: Wool regulates temperature and the mini springs create airflow, so a child who runs hot at night gets a cooler surface than foam would give them.
- Cheap, easy bedding: Standard single sheets and a single duvet fit, and they are the most widely stocked and affordable bedding of any UK size.
- A generous spare room upgrade: In a spare room that doubles as an office, one UK single keeps the desk usable while giving guests a genuinely comfortable, naturally filled bed.
This size suits you if...
You're buying for a child or teenager and want natural materials rather than foam next to a growing sleeper, you're a lighter solo adult who prefers a gently cushioned surface, or you're furnishing a spare room and would rather give occasional guests something properly made than a budget stopgap. It also suits compact rooms: allow at least 2.1m x 2.8m of floor space and it fits comfortably.
Consider another size if...
You share the bed, or you're a broader adult who feels hemmed in at 90cm wide. We'd recommend the UK double instead: it's 45cm wider and the same length, and we suggest a room of at least 2.6m x 2.8m for it.
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What are the dimensions of the Ruby 12500 UK single?
The UK single measures 90 x 190cm, which is 3ft x 6ft 3in. It's the standard one-person size in the UK, and the same length as the UK small double and UK double, so upgrading later only changes the width you need.
Will the Ruby 12500 UK single fit a bunk or mid sleeper frame?
The width matches standard bunk and mid sleeper frames, but this mattress is 29cm deep, which is more than many raised frames allow. Check the frame's maximum mattress depth and guard rail height before buying; a mattress this deep can sit above the safety rail on a bunk.
Is the Ruby 12500 UK single suitable for a child?
It's a good match in feel: the soft to medium surface suits lighter bodies, and comfort comes from wool, cotton, hemp and flax rather than memory foam. It's a premium spend for a child's room, but the natural fillings and breathability make it a long-lasting choice.
How much floor space does a UK single need?
We suggest allowing at least 2.1m x 2.8m. That leaves room to walk alongside the bed and open drawers or a wardrobe. At 90cm wide, this size also works under a loft conversion slope or in a narrow box room where nothing wider would fit.
Where can I buy the Ruby 12500 in a UK single?
Compare the retailers listed on this page; the prices shown here are updated as retailers change them. Because Harrison Spinks mattresses are sold through independent bed retailers rather than direct, availability in specific sizes can shift, so it's worth checking the live table rather than assuming.