Harrison Spinks Ruby 12500 Pocket 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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The Harrison Spinks Ruby 12500 is listed as a soft to medium feel, which means a gentler, more cushioned surface than a true medium. Inside you'll find British wool blended with hemp, flax and cotton rather than foam, so it should feel breathable and naturally plush. It comes in sizes from UK Single up to Super King. It's a considered, natural-fill choice, at a premium price, backed by a 5-year guarantee with a further 5-year warranty noted after that.
Mattress specifications
Firmness
Medium
Type
Pocket Spring
Depth (cm)
29
Number of Layers
5
Trial Period (nights)
100
Warranty (years)
5
Price Range
£1,249 to £2,399
Best Sleeping Position(s)
Side Sleeping
Back Sleeping
Combination Sleeping
Certifications
BS 7177
Assessed from the specification published by Mattress Online, captured September 2026, and from regular price comparison across our UK retail partners.
Why should you choose this mattress?
This mattress suits you if you want natural materials and a softer, cradling feel. The wool, hemp and flax fillings shape around your body, which means a snug, enveloping surface rather than a firm platform, and cotton in the blend helps wick away moisture if you tend to sleep warm. The 1,800 mini Posturfil springs plus 10,000 bouncy mini springs adapt as you move and create pockets of airflow. The glue-free Cortec Quad support system is also easily recyclable, a genuine plus if sustainability matters to you. Yes, it's a significant spend, but the spring count and natural fillings go some way to justifying it. MattressOnline lists a 100-night trial, so you can change your mind.
Key features & 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.
Best suited for?
Side sleepers
The wool, hemp and flax comfort layer shapes around your body, which means a cushioned, cradling surface for shoulders and hips.
Warm sleepers
Cotton in the blend is good at wicking away moisture, and the 10,000 mini springs create pockets of airflow, which helps you stay comfortable if you run warm.
Eco-conscious buyers
The glue-free Cortec Quad support system is more easily recyclable at the end of its life, and the fillings are natural wool, hemp, flax and cotton rather than foam.
Lighter sleepers
With a soft to medium feel and a plush wool layer, this gives a snug, enveloping surface that lighter bodies can sink into comfortably.
Combination sleepers
The 1,800 mini Posturfil springs adapt with your body as you move through the night, so changing position should feel supported rather than stuck.
If you prefer a properly firm surface, this isn't it: the listing rates it soft to medium, so heavier sleepers or dedicated front sleepers may sink in more than they'd like. It's also a real investment, so budget shoppers should look elsewhere. And if you need it quickly, note delivery can take up to 7 weeks.
Save on an earlier or ex-display model
Some retailers still sell the earlier version of this mattress, or ex-display and returned stock at a lower price. These are the sizes where it costs less than the current model's best price.
Harrison Spinks Ruby 12500 Pocket Mattress (Medium Feel)
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FAQ's
How firm is the Harrison Spinks Ruby 12500 mattress?
The MattressOnline listing gives it a soft to medium feel firmness rating, gentler than a standard medium. That means a cushioned, cradling surface that suits side sleepers and lighter bodies, although those wanting firmer support may find it a little too yielding. The page also notes the model comes in other firmness options.
How many springs does the Ruby 12500 have?
12,500 in total: 1,800 mini Posturfil springs, 10,000 bouncy mini springs for airflow and comfort, and 700 Cortec Quad support springs grouped in fours within fabric pockets. The Cortec system is glue-free, which makes it easier to recycle.
Does the Harrison Spinks Ruby 12500 come with a trial?
MattressOnline lists a 100-night trial with this mattress. That's the retailer's own offer rather than a manufacturer promise, so if you buy elsewhere, check that retailer's terms before ordering.
What is the guarantee on the Ruby 12500?
The listing states a 5-year guarantee, with an additional 5-year warranty noted thereafter. As with the trial, these are terms shown on the MattressOnline page, so confirm cover with whichever retailer you buy from.
What sizes does the Ruby 12500 come in?
Five UK sizes: Single, Small Double, Double, King and Super King. The mattress is 29cm deep, so check your fitted sheets will accommodate it.
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