Firmness
Medium Soft
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)
Certifications
Assessed from the specification published by Mattress Online, captured September 2026, and from regular price comparison across our UK retail partners.
The main appeal here is the spring system. Each Cortec Quad Revolution unit places a smaller support spring inside a larger comfort spring, which means the mattress can feel soft when you settle in but firmer once you press deeper into it. A layer of 2500 micro springs above adds adaptable bounce, so you shouldn't feel stuck in one position. The fillings are natural throughout: British wool for plushness, plus cotton, hemp and flax that wick moisture, helpful if you tend to sleep warm. The cover meets fire safety standards without FR chemicals. Yes, £779 to £1,469 is a real spend, but you're getting a UK-handcrafted mattress from a National Bed Federation approved brand with a 5 year guarantee.
Key Features & what's inside
- Cover. An in-house woven cover that meets fire safety standards without FR chemicals, which means fewer additives next to your skin. A small but genuine plus for anyone conscious of what goes into their bedding.
- Wool comfort layer. A layer of British wool sits near the surface, giving that plush, sumptuous first impression when you lie down. Wool also handles temperature well, so it stays comfortable through the night.
- Blend comfort layer. A blend of cotton, hemp and flax wicks moisture away from you as you sleep. In practice that means a fresher, drier feel, particularly useful if you run warm.
- Hemp and Ecotex layer. Layers of hardwearing hemp and strong Ecotex fibres add structure to the mattress. This helps reduce dips forming in the surface over time.
- Micro springs. A layer of 2500 micro springs provides additional bounce that adapts to your body. These respond quickly as you move, so changing position feels easy rather than effortful.
- Pocket springs support system. The base is 1000 Cortec Quad Revolution pocket springs, each with a smaller support spring nested inside a larger comfort spring, wrapped in a cloth pocket and secured in groups of four. The result is a softer initial feel backed by deeper support when you need it.
Layer details from mattressonline.co.uk product page, September 2026.
Who's it NOT for?
If you prefer a firm mattress, this Soft to Medium feel probably isn't for you, and heavier sleepers who need more pushback may sink further than they'd like. It's also not the pick if you want the slow, cradling hug of memory foam: this is a springy, responsive feel with natural fillings instead.
Harrison Spinks Bronze 3500 Pocket Ortho Mattress (Soft to Medium Feel)
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How firm is the Harrison Spinks Bronze 3500?
It has a Soft to Medium feel. The dual spring design means it feels gentle at first but offers firmer support as you settle in, which suits side sleepers and lighter builds. If you know you need a properly firm surface, look elsewhere in the range.
How many springs does the Bronze 3500 have?
3500 in total: 1000 Cortec Quad Revolution pocket springs in the support base, plus 2500 micro springs above them for adaptable bounce. Each pocket spring is actually two springs in one, with a smaller support spring nested inside a larger comfort spring.
Does the Harrison Spinks Bronze 3500 come with a trial?
MattressOnline lists a 100-night comfort trial with this mattress. That's the retailer's own offer rather than a Harrison Spinks policy, so if you buy elsewhere, check that retailer's terms before ordering.
What is the guarantee on the Bronze 3500?
There's a 5 year manufacturer guarantee, and the MattressOnline listing mentions an additional 5 year warranty thereafter. Keep your proof of purchase, and check the exact terms with your retailer at the point of sale.
What sizes does the Bronze 3500 come in?
Five UK sizes: Single, Small Double, Double, King and Super King, priced from £779 up to £1,469 depending on size. The mattress is 27cm deep, so standard fitted sheets should work fine.
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