Firmness
Type
Pocket Spring
Depth (cm)
27
Number of Layers
Trial Period (nights)
100
Warranty (years)
10
Price Range
£2,999 to £5,999
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 this one if you want natural fillings and old-fashioned construction rather than foam and gel. The blend of cashmere, silk and British wool helps regulate temperature naturally, which matters if you tend to sleep warm. It is dual-sided, so you can flip it to even out wear over the years, something most modern mattresses no longer allow. Three rows of hand side-stitching firm up the edges, meaning you can sleep right to the side without feeling you might roll off. Delivery is free, and the 27cm depth suits standard fitted sheets. The price is high, but the materials and 10-year guarantee go some way to justifying it.
Key Features & what's inside
Awaiting up to date specifications. Please check back later.
Who's it NOT for?
If your budget sits under £2,999 this is simply out of reach, and plenty of good mattresses cost far less. It is also not the choice if you prefer the cradling, sink-in feel of memory foam, or if you want a no-turn mattress: being dual-sided, it needs flipping to wear evenly.
Flaxby Platinum Lunar Mattress
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How firm is the Flaxby Platinum Lunar mattress?
It is available in soft, medium and firm tensions, so rather than a single fixed feel you pick the tension that suits you. As a rough guide, lighter people and side sleepers often prefer softer tensions, while heavier people and back sleepers tend to get on better with medium or firm.
Does the Flaxby Platinum Lunar come with a trial period?
Yes, there is a 100-night comfort guarantee, listed on featherandblack.com as a site-wide policy, alongside a 10-year guarantee on the mattress itself. That gives you around three months to decide whether the tension you chose is right.
How many springs does the Flaxby Platinum Lunar have?
The specification lists 11,925 calico pocket springs for the double, although the brand's own page also refers to over 13,000 springs in places, so the exact figure varies by size. Either way it is a very high count, which means finer, more responsive support across the surface.
Do you need to turn the Flaxby Platinum Lunar mattress?
Yes, it is dual-sided, so it is designed to be flipped to keep wear even across both surfaces. Padded handles are built in to make turning easier, which is welcome given the depth. If you want a no-turn mattress, this is not the one.
How much does the Flaxby Platinum Lunar cost?
Prices range from £2,999 to £5,999 depending on size and options, with UK Single, Double, King and Super King available. That is firmly at the premium end, though the natural fillings, high spring count and 10-year guarantee are where the money goes.
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