Firmness
Type
Pocket Spring
Depth (cm)
35
Number of Layers
4
Trial Period (nights)
Warranty (years)
10
Price Range
£3,999 to £6,999
Best Sleeping Position(s)
Certifications
Assessed from Flaxby's published specification for this mattress, captured September 2026, and from regular price comparison across our UK retail partners.
Choose the Platinum Eclipse if natural materials matter to you. Every filling here is a natural fibre, from responsibly sourced British wool to cashmere and alpaca, which means a breathable sleep surface that handles temperature swings better than synthetic foams tend to. The hemp and flax layers are there specifically to regulate heat, useful if you sleep warm. Underneath, 13,440 handsewn calico pocket springs plus two layers of high density micro springs give firm, contouring support that responds to your shape rather than just pushing back. It's firm, so lightweight side sleepers may find it a little unforgiving. But for back and front sleepers who like solid support with a natural feel, it makes a strong case, provided the budget allows.
Key Features & what's inside
- Comfort layers. Naturally soft layers of wool, cotton, mohair, silk, cashmere and alpaca sit at the top. These fibres breathe well and wick moisture, which means a surface that feels soft against you without trapping heat.
- Temperature-regulating layers. Beneath the comfort fillings sit naturally temperature-regulating layers of hemp and flax. These help keep the mattress closer to a steady temperature through the night, a genuine plus if you run hot.
- Pocket springs. The core is over 13,000 handsewn calico pocket springs. Each spring moves independently, which means support that follows your shape and less disturbance when a partner shifts position.
- Micro springs. Two layers of high density micro springs add extra contouring support above the main unit. In practice this softens the transition between the firm spring core and the natural fillings, so the surface adapts more precisely to shoulders and hips.
Layer details from featherandblack.com product page, September 2026.
Who's it NOT for?
This is a firm mattress, so lightweight side sleepers may find it too unyielding around the shoulders and hips. Anyone who prefers the cradling, sink-in feel of memory foam should look elsewhere, as there's no foam here at all. And at £3,999 upwards, it's simply out of reach for many budgets.
Flaxby Platinum Eclipse Mattress
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Is the Flaxby Platinum Eclipse mattress firm or soft?
Flaxby describes it as firm. The 13,440 calico pocket springs and two layers of high density micro springs provide contouring support, while natural fillings such as wool, cashmere and alpaca soften the surface. Back and front sleepers are the most likely match; lightweight side sleepers may find it a little too firm.
How much does the Flaxby Platinum Eclipse cost?
Prices range from £3,999 to £6,999 depending on size, with UK Single, Small Double, Double, King and Super King available. It's a significant outlay, but the spring count, 35cm depth and all-natural fillings help explain where the money goes. Delivery is free on all orders.
What is the Flaxby Platinum Eclipse made of?
Entirely natural fillings: wool, cotton, mohair, silk, cashmere and alpaca in the comfort layers, plus hemp and flax for temperature regulation. Support comes from 13,440 handsewn calico pocket springs and high density micro springs. It's free from FR chemicals and glue, and the British wool is responsibly sourced.
Does the Flaxby Platinum Eclipse have a guarantee?
Yes, it comes with a 10-year guarantee, along with free delivery on all orders. That's a reasonable span of cover for a mattress at this price, though as always it's worth reading the guarantee terms before you buy.
Is the Flaxby Platinum Eclipse good for hot sleepers?
It should suit hot sleepers well. It includes dedicated temperature-regulating layers of hemp and flax, and the other fillings, including wool, cotton and silk, are all breathable natural fibres. There's no foam to trap heat, which means the surface stays closer to a comfortable temperature overnight.
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