Harrison Spinks Ruby 12500 Pocket Mattress (Firmer Feel)
The Harrison Spinks Ruby 12500 Pocket Mattress (Firmer Feel) is a pocket spring mattress with a firm feel.
- Designed firm from the start
- Localised support at hips & shoulders
- From a long-established British maker
£1,249
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The Harrison Spinks Ruby 12500 uses pocket springs that move independently, which means the mattress responds to each part of your body rather than tilting you towards a partner. It comes in five sizes, from UK Single up to UK Super King. It carries a premium price, so it suits buyers who want a traditional spring build and plan to keep the mattress for years, rather than anyone shopping on a tight budget.
Mattress specifications
Firmness
Firm
Type
Pocket Spring
Depth (cm)
Number of Layers
5
Trial Period (nights)
Warranty (years)
Price Range
£1,249 to £2,399
Best Sleeping Position(s)
Back Sleeping
Stomach Sleeping
Certifications
Assessed from the product page published by Mattress Online, captured September 2026, and from regular price comparison across our UK retail partners.
Why should you choose this mattress?
If you prefer a firm sleeping surface, this mattress is built around that feel from the start rather than firming up a softer design. Pocket spring construction gives you localised support, which means your hips and shoulders are held where they press down rather than the whole surface dipping. Harrison Spinks is a long-established British maker, and this model sits at the pricier end, which reflects that positioning.
Key features & layer details
Mini pocket springs
Small, individually cased springs sit in the comfort layer and add cushioning while cutting down motion transfer. In practice, you get a little give on top of the firm feel, and less disturbance when a partner moves.
Wool
Wool comfort filling, described as a natural insulator with temperature-regulating properties. It helps keep you from getting too warm or too cool as the night goes on.
Cotton
Natural cotton fibres create a fresh sleeping environment and wick away moisture. That should help the surface feel drier and fresher, especially if you tend to sleep warm.
Hemp
Hemp is an eco-friendly fibre that is naturally breathable and durable. It lets air move through the filling and should help the mattress keep its feel over time.
Flax
Flax fibres are durable and breathable, and are described as having anti-bacterial properties. This is a hard-wearing natural layer that adds to the airy feel of the fillings above it.
Layer details from mattressonline.co.uk and simplybedssussex.co.uk product pages, October 2026.
Best suited for?
Back sleepers
A firm surface built around that feel from the start keeps the body level, so your hips are held up rather than sinking in.
Front sleepers
Firm pocket spring support holds your hips where they press down, which means your midsection is less likely to dip into the surface.
Couples
Pocket springs move independently, so the mattress responds to each of you separately rather than tilting one person towards the other.
Heavier sleepers
Localised pocket spring support holds hips and shoulders where they press down, which suits anyone who wants a firm, traditional spring feel under more weight.
This is a firm mattress, so lightweight side sleepers may find it a little too unyielding at the shoulder and hip, which can cause pressure points. It is also a considerable spend, so budget-focused buyers or anyone unsure they want a firm feel should look elsewhere first.
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 (Firmer Feel)
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FAQ's
How firm is the Harrison Spinks Ruby 12500?
This version is listed as firm, and the product title specifies a Firmer Feel. The Ruby 12500 is sold in more than one firmness option, so check carefully at checkout that you are ordering the firmer variant if that is the feel you want.
What sizes does the Harrison Spinks Ruby 12500 come in?
It is available in five UK sizes: Single, Small Double, Double, King and Super King.
Does the Harrison Spinks Ruby 12500 come with a guarantee?
The retailer listing for this mattress shows a 5 Year Guarantee. As this is stated on a retailer's page rather than the manufacturer's, it is sensible to confirm the guarantee terms with whichever retailer you buy from before ordering.
Is the Harrison Spinks Ruby 12500 a pocket spring mattress?
Yes. It uses pocket springs, which are individually wrapped coils that compress independently, which means the mattress supports each area of your body separately and reduces the feeling of movement transferring across the bed when a partner shifts position.
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