Harrison Spinks Ruby 12500 Pocket 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
- The classic shared size: At 135 x 190cm (4ft 6in x 6ft 3in), the UK double is the long-standing standard for couples, and it fits rooms where a UK king would feel cramped.
- Room for bedside tables both sides: In a typical UK bedroom, allow at least 2.6m x 2.8m, which usually leaves space for a bedside table on each side and a clear walkway.
- 12,500 springs across a shared surface: The pocket spring construction responds to each sleeper independently, so a partner shifting position is less likely to disturb you than on a traditional open coil.
- Natural fillings for two warm bodies: Two people generate more heat than one, and the wool, cotton, hemp and flax blend helps wick moisture away rather than trapping it the way foam can.
- Easy to dress and replace bedding: Double sheets and a 200 x 200cm double duvet are stocked everywhere at every price, which keeps the running costs of this premium mattress down.
This size suits you if...
You share the bed every night and want a natural-fill mattress in a size that leaves your bedroom feeling like a room rather than a mattress showroom. It also suits a well-used guest room where visiting couples stay regularly, since the softer, cradling feel is an easy surface for most guests to settle into. Solo sleepers who like to spread out, or who share with a dog claiming a corner, will find it generous too.
Consider another size if...
You and your partner both like space, or one of you is a restless sleeper, and your room measures at least 2.7m x 2.9m. We'd recommend the UK king instead: it's 15cm wider and 10cm longer than the UK double.
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FAQ's
Is the Harrison Spinks Ruby 12500 UK double big enough for a couple?
Yes, with a caveat. The UK double gives two people sharing 67.5cm each, roughly the width of a cot, which suits couples who sleep close or have a smaller room. The 12,500 springs help here, since each side responds independently to movement. If either of you is broad-shouldered or restless, the UK king's extra 15cm of width is money well spent.
What room size do I need for the Ruby 12500 in a UK double?
We suggest allowing at least 2.6m x 2.8m, with around 3m x 3m the comfortable norm. That usually leaves room for bedside tables on both sides, a wardrobe and a chest of drawers, which matters if you're furnishing a first flat or second bedroom and the bed has to share the space.
Should I buy the Ruby 12500 in a UK double or a UK king?
It comes down to room size and sleeping style. The UK double is 15cm narrower and 10cm shorter than the UK king, so it suits rooms under our suggested 2.7m x 2.9m minimum for the UK king. Given the Ruby 12500's soft to medium feel, sleepers tend to settle into their own spot, so close-sleeping couples manage well on the UK double.
Will a UK double Ruby 12500 get up narrow stairs?
Harrison Spinks doesn't publish a weight for this mattress, and as a 29cm deep pocket spring build with natural fillings it won't roll or fold the way a boxed foam mattress can. At 135 x 190cm it's a manageable size for most homes, but measure turning stairs in older terraces and tight new build landings before ordering.
Is the Ruby 12500 double a good choice for a guest room?
A strong one, if the budget allows. The UK double is the natural guest room size because it handles visiting couples and solo guests equally well, and double bedding is cheap and easy to find. The soft to medium feel suits most people for short stays. It is a premium mattress, though, so it makes most sense in a room that gets regular use.