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)
Certifications
Assessed from the specification published by Mattress Online, captured September 2026, and from regular price comparison across our UK retail partners.
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 & what's inside
- 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.
Who's it NOT for?
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 at £1,249 and up, so budget shoppers should look elsewhere. And if you need it quickly, note delivery can take up to 7 weeks.
Harrison Spinks Ruby 12500 Pocket Mattress (Medium Feel)
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, priced from £1,249 to £2,399. The mattress is 29cm deep, so check your fitted sheets will accommodate it.
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