Firmness
Firm
Type
Pocket Spring
Depth (cm)
27
Number of Layers
5
Trial Period (nights)
100
Warranty (years)
5
Price Range
£779 to £1,469
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 spring-only build, with no foam in the comfort layers. The wool, hemp and flax fillings wick moisture, which means a fresher, cooler night if you tend to overheat. The 3500 total spring count, made up of 1000 pocket springs and 2500 micro springs, gives contouring without the sinking feeling foam can create. It carries National Bed Federation approval and conforms to BS7177: 2008 for home use. If you buy through MattressOnline, they list a 100-night trial and a 5-year guarantee, with free delivery to your front door within 7 weeks and old mattress removal for £35. Those terms are the retailer's own, not the brand's.
Key Features & what's inside
- British wool. A layer of British wool creates a plush, sumptuous sleeping surface. Wool also regulates temperature naturally, which means you're less likely to wake up clammy.
- Cotton, hemp and flax blend. A blend of cotton, hemp and flax wicks moisture away from your body. In practice, that keeps the mattress feeling fresher for longer.
- Hemp and Ecotex fibres. Hard-wearing hemp and strong Ecotex fibres complete the comfort layers. These add durability, which means the surface should hold its shape over time.
- Micro springs. Layers of 2500 micro springs sit beneath the fillings, adding gentle bounce. They adapt to your body, which means a more responsive feel than fillings alone.
- Pocket springs. The base layer holds 1000 Cortec Quad Revolution pocket springs. Each spring moves independently, which means support where you need it and less disturbance from a restless partner.
Layer details from mattressonline.co.uk product page, September 2026.
Who's it NOT for?
If you love the slow, cradling hug of memory foam, this spring-and-fibre build will feel bouncier and more traditional than you want. Budget shoppers may find the £779 starting price a stretch. And if you need certainty on firmness before buying, the mixed firmness labelling here means you should check with the retailer first.
Harrison Spinks Bronze 3500 Pocket Ortho Mattress (Firmer Feel)
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How firm is the Harrison Spinks Bronze 3500?
The MattressOnline listing gives this model a soft to medium feel firmness rating, although the page shows soft to medium, medium and firm versions available. Firmness is subjective and depends on your weight and sleeping position, so confirm the exact version before you order.
How many springs does the Bronze 3500 have?
3500 in total: 1000 Cortec Quad Revolution pocket springs providing the core support, topped with 2500 micro springs that add adaptable bounce closer to the surface.
Does the Harrison Spinks Bronze 3500 come with a trial?
MattressOnline lists a 100-night trial and a 5-year guarantee. These are that retailer's own terms rather than a brand-wide offer, so if you buy elsewhere, check what that shop provides.
How deep is the Bronze 3500 mattress?
It's 27cm deep. Standard fitted sheets should work fine, though it's slightly deeper than some older mattresses, so measure if your sheets are snug.
What sizes does the Bronze 3500 come in?
Five UK sizes: Single, Small Double, Double, King and Super King. Prices range from £779 to £1,469 depending on size.
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