Firmness
Medium Firm
Type
Pocket Spring
Depth (cm)
25
Number of Layers
5
Trial Period (nights)
100
Warranty (years)
5
Price Range
£1,018
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 is built almost entirely around springs rather than foam, which means a responsive, breathable feel with a bit of bounce. The 1,000 Advanced Cortec Quad pocket springs work independently, so you get support tailored to where you actually put weight, and the mini spring layers above add cushioning without trapping heat. If you're a hot sleeper, that all-spring construction and knitted cover should feel noticeably airier than memory foam. The medium feel suits most sleepers, although anyone wanting a properly firm surface may find it a little forgiving. It uses a natural fire retardant formula, conforms to BS7177: 2008 and is 100% recyclable, a rare tick for anyone thinking about end-of-life disposal.
Key Features & what's inside
- Cover. A soft, quilted knitted cover that adds a cosy, warm surface feel. It's designed to enhance airflow, so it stays breathable rather than clammy.
- Comfort fillings. Soft White Fibres, which are soft synthetic fillings that create a cosy top layer. They're durable and resilient, so they should hold their shape over time.
- Advanced Cortec Quad pocket springs. 1,000 Advanced Cortec Quad pocket springs, each encased in its own fabric pocket so they move independently. That means personalised, responsive support that helps keep your spine aligned.
- HD mini pocket springs. Layers of 4,000 HD springs and 2,500 HD springs working together beneath the comfort layer. The effect is a bounce-back feel with added comfort.
- Posturfil mini pocket springs. 1,000 Posturfil mini springs adding extra bouncy comfort. They also aid breathability, helping to move moisture and heat away from your body.
Layer details from mattressonline.co.uk product page, September 2026.
Who's it NOT for?
If you want a flip-able, double-sided mattress, this isn't one: the listing states it's single-sided and should be rotated every six months instead. It's only available in a UK Double, so it won't suit anyone needing another size. And if you prefer the slow, sinking hug of memory foam, this springy, responsive feel may disappoint.
Harrison Spinks Quilted Fusion 8000 Pocket Mattress
Is the Harrison Spinks Quilted Fusion 8000 firm or medium?
The retailer product page describes the feel as medium, which means a balanced surface that suits most sleeping positions. Yes, that's softer than some retailer listings suggest, but the 8,500-spring construction still provides plenty of underlying support. Very heavy sleepers or dedicated firm-mattress fans may want something with more resistance.
How many springs does the Quilted Fusion 8000 have?
It contains 8,500 springs across four layers: 1,000 Advanced Cortec Quad pocket springs, 4,000 and 2,500 HD mini springs, and 1,000 Posturfil mini springs. The 8000 in the name is branding rather than a spring count.
Does the Harrison Spinks Quilted Fusion 8000 come with a trial?
Mattress Online, currently the only retailer stocking it, lists a 100-night trial and a 5-year guarantee. These are the retailer's own terms rather than a manufacturer promise, so check them at checkout before you buy.
Can you flip the Quilted Fusion 8000 mattress?
No. The listing states it's single-sided, so it shouldn't be flipped. Instead, rotate it end to end every six months to help the fillings settle evenly and extend its life.
How deep is the Harrison Spinks Quilted Fusion 8000?
It's 25cm deep, which means standard deep fitted sheets should fit without a struggle. That depth houses four spring layers plus soft fibre fillings beneath the quilted knitted cover.
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