Harrison Spinks Byron Mattress
The Harrison Spinks Byron is a firm, dual-sided natural mattress built around 13,060 springs across seven layers, which means support that adjusts to your shape with very little partner disturbance.
- Winter & summer sides, flip seasonally
- Firm feel, contours shoulders & hips
- Glue-free, fully recyclable springs
£2,449
Get the lowest price we've found
The Harrison Spinks Byron's fillings are the real story: cashmere, mohair, cotton, hemp, flax, silk and traceable British wool, with a warmer wool-rich winter side and a breathable cotton summer side you flip between seasonally. At 29cm deep, it sits firmly in luxury territory. The price is a serious commitment, but the glueless, recyclable Cortec spring system and natural fillings go some way towards justifying it.
Mattress specifications
Firmness
Firm
Type
Pocket Spring
Depth (cm)
29
Number of Layers
4
Trial Period (nights)
100
Warranty (years)
7
Price Range
£2,449 to £4,549
Best Sleeping Position(s)
Back Sleeping
Stomach Sleeping
Certifications
Assessed from the specification published by Feather & Black, captured September 2026, and from regular price comparison across our UK retail partners.
Why should you choose this mattress?
Choose the Byron if you want a genuinely natural, seasonally flippable mattress with a firm feel. Seven layers of micro and Cortec pocket springs, 13,060 in total, give precise contouring, which means the surface responds to your shoulders and hips rather than pushing back as one flat slab. Wool and silk on the winter side absorb moisture and regulate temperature, so hot sleepers get help too. The Cortec springs are glueless and fully recyclable, a rare thing at any price. It comes in six sizes up to Emperor. Yes, it's expensive, but Feather & Black lists a 100-night comfort promise and a 7-year guarantee, which softens the risk a little.
Key features & layer details
Top surface
Generously layered with 100% natural cashmere, mohair, cotton, hemp, flax and British wool. This is the winter side, where insulating wool with silk absorbs moisture and helps regulate temperature, which means fewer clammy nights in colder months.
Fillings
Soft cashmere, sourced as a byproduct from the fashion industry, brings insulation and a supremely gentle surface feel. It sits alongside traceable British sheep's wool from the British Wool partnership.
Springs
13,060 responsive springs across seven layers of high-density micro and Cortec pocket springs, which means very precise, localised support. The Cortec system is glueless and 100% recyclable.
Reverse surface
A breathable cotton side designed for summer use. Flip the mattress with the seasons to get the right sleeping temperature year round.
Layer details from featherandblack.com product page, September 2026.
Best suited for?
Warm sleepers
The breathable cotton summer side and the wool and silk winter side let you flip the mattress with the seasons, keeping temperature comfortable all year.
Eco-conscious buyers
Glueless, fully recyclable Cortec springs and natural fillings such as traceable British wool and cashmere sourced as a fashion byproduct make this a genuinely natural build.
Back sleepers
A firm feel and 13,060 pocket springs across seven layers give precise support, so the surface responds to your shoulders and hips rather than acting like a flat slab.
Couples
Individually responsive pocket springs contour to each body separately, and six sizes up to Emperor leave plenty of room to choose a width that suits two.
Heavier sleepers
The firm feel, 29cm depth and dense layers of micro and Cortec springs give a sturdy, supportive surface that is less likely to feel unyielding.
This is a firm mattress, so lightweight side sleepers may find it too unyielding at the shoulder and hip. It also needs flipping seasonally, which is awkward if you struggle to turn a heavy mattress. And with a premium starting price, it's simply not the right buy if your budget sits anywhere near the mainstream.
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 Byron Mattress
Select a comparison article below or choose to compare this mattress side by side with up to 2 other mattresses.
Did you know? On Mattress Unboxed we have over 1,000 different mattresses to suit all types of sleepers. View all mattresses.
FAQ's
How firm is the harrison spinks byron mattress?
It's listed as firm. That suits back and front sleepers and heavier builds well, although lightweight side sleepers may find it a little too solid for comfortable pressure relief at the shoulder.
How many springs does the harrison spinks byron have?
It has 13,060 springs arranged in seven layers of high-density micro and Cortec pocket springs. The Cortec springs are glueless and 100% recyclable, and the layered design means more precise contouring than a single layer of standard pocket springs.
Does the harrison spinks byron come with a trial and guarantee?
Feather & Black lists a 100-night comfort promise and a 7-year guarantee. These are the retailer's own terms rather than Harrison Spinks manufacturer offers, so check the conditions wherever you buy.
What sizes is the harrison spinks byron available in?
Six UK sizes: Single, Small Double, Double, King, Super King and Emperor.
Do you need to flip the harrison spinks byron mattress?
Yes. It's dual-sided, with a warmer wool and silk winter side and a breathable cotton summer side, so you flip it seasonally. Bear in mind it's a substantial 29cm-deep mattress, so turning it is easier with two people.
Couldn't find an answer to your question? Send us a message