Harrison Spinks Bronze 3500 Pocket Ortho Mattress (Medium Feel)
The Harrison Spinks Bronze 3500 is a pocket spring mattress handcrafted in the UK, with a soft to medium feel in this variant.
- Natural fillings keep hot sleepers cool
- Micro springs adapt to your shape
- Cover made without FR chemicals
£779
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The Harrison Spinks Bronze 3500 combines 1000 Cortec™ Quad Revolution® pocket springs with 2500 micro springs, which means you get responsive, adaptable support rather than the flat, dense feel of foam. Natural fillings including British wool, cotton, hemp and flax sit on top, and the cover is made without FR chemicals. It's 27cm deep and sits in the mid-to-upper bracket, but the spring count and natural materials go some way to justifying that. Five sizes are available, from UK Single up to Super King.
Mattress specifications
Firmness
Medium
Type
Pocket Spring
Depth (cm)
27
Number of Layers
6
Trial Period (nights)
100
Warranty (years)
5
Price Range
£779 to £1,469
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 makes sense if you want natural materials and springs rather than foam. The wool, cotton, hemp and flax fillings wick away moisture, which means hot sleepers should stay noticeably cooler than they would on memory foam. The 3500 total spring count gives adaptable support across the body, and the FR chemical-free cover will appeal if you're wary of chemical treatments. It's National Bed Federation approved and conforms to BS7177: 2008.
Key features & layer details
Cover
An in-house woven cover made without FR chemicals, meeting fire safety standards naturally. That means a healthier sleep environment without chemical treatments.
Wool
A layer of British wool gives a plush, sumptuous sleeping surface. Wool also regulates temperature well, which helps if you tend to sleep warm.
Cotton, Hemp and Flax blend
This blended layer wicks away moisture, which means the surface stays feeling fresher through the night.
Hemp and Ecotex
Hemp and strong Ecotex fibres complete the comfort layers, adding durability and structure beneath the softer fillings.
Micro springs
Layers of 2500 micro springs sit beneath the fillings, providing extra bounce that adapts to your body shape.
Pocket Springs
The base layer holds 1000 Cortec™ Quad Revolution® pocket springs, with each dual spring in a cloth pocket and secured in groups of four. This gives independent, targeted support and helps limit partner disturbance.
Layer details from mattressonline.co.uk product page, September 2026.
Best suited for?
Warm sleepers
Wool, cotton, hemp and flax fillings wick away moisture and regulate temperature, which means you should stay cooler than you would on memory foam.
Couples
Each dual spring sits in its own cloth pocket and is secured in groups of four, which helps limit partner disturbance during the night.
Eco-conscious buyers
Natural British wool, cotton, hemp and flax fillings sit over the springs, so you get a mattress built around natural materials rather than foam.
Combination sleepers
The 2500 micro springs add bounce that adapts to your body shape, which means moving between positions feels responsive rather than stuck in foam.
Side sleepers
A medium feel with a plush wool top and adaptable spring support gives shoulders and hips some cushioning while the body stays supported.
If you prefer a properly firm surface, this soft to medium variant is unlikely to suit, particularly for heavier back or front sleepers who need more pushback. And if you love the sink-in hug of memory foam, the springy, natural-fibre feel here will be quite different from what you're used to.
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 Bronze 3500 Pocket Ortho Mattress (Medium Feel)
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FAQ's
How firm is the Harrison Spinks Bronze 3500 mattress?
This variant has a soft to medium feel, according to the MattressOnline listing. That suits side sleepers and lighter builds well, although those wanting firmer support may prefer another option, as the listing notes the model is also available in medium and firm.
How many springs does the Harrison Spinks Bronze 3500 have?
There are 3500 springs in total: 1000 Cortec™ Quad Revolution® pocket springs, each dual spring held in a cloth pocket and secured in groups of four, plus 2500 micro springs in the comfort layers for adaptable bounce.
Does the Harrison Spinks Bronze 3500 come with a trial?
MattressOnline lists a 100-night trial with this mattress. That trial is the retailer's own offer rather than a Harrison Spinks guarantee, so if you buy elsewhere, check that retailer's returns terms before ordering.
What guarantee does the Harrison Spinks Bronze 3500 have?
The MattressOnline listing states a 5-year guarantee, which matches the warranty other retailers list. Check the exact terms with the retailer you buy from.
What sizes does the Harrison Spinks Bronze 3500 come in?
Five UK sizes are available: Single, Small Double, Double, King and Super King.
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