Flaxby Platinum Eclipse Double Mattress
The Flaxby Platinum Eclipse is a firm, handmade natural mattress with 13,440 calico pocket springs and comfort layers of wool, cotton, mohair, silk, cashmere and alpaca.
- Firm support for back & front sleepers
- Natural fibres help regulate heat
- Minimises partner disturbance
£4,999
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Flaxby Platinum Eclipse Mattress
More available sizes
Mattress details
Mattress
Flaxby Platinum Eclipse Mattress
Size
Firmness
Firm
Construction
Foam
Pocket Spring
Wool
Memory Foam
Natural
Depth (cm)
35
Layers
4
Layer Details
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.
Key benefits
- A footprint most rooms can take: At 135 x 190cm it fits comfortably in the average UK bedroom, so you can spend on the mattress rather than reworking the room around it.
- Room for two, sensibly: Two people sharing get 67.5cm of width each, enough for couples who sleep close, though restless sleepers may notice the limit.
- Firm support across the shared surface: The calico pocket springs move independently, which means one of you turning over disturbs the other less than a connected spring unit would.
- Natural fibres for two warm bodies: Wool, hemp and flax layers regulate heat, useful in a double where two sleepers share a smaller surface than a king offers.
- Bedding is easy and cheap to find: Double sheets and 200 x 200cm duvets are stocked everywhere at every price, a small saving that softens a luxury purchase slightly.
This size suits you if...
You share the bed every night and your room suits a double better than a king, you want bedside tables on both sides without squeezing past the bed frame, or you sleep alone and want proper space to stretch out on a natural, firm surface that will last.
Consider another size if...
You and your partner both move around at night and 67.5cm each feels tight. We'd recommend the UK king instead: it's 15cm wider and 10cm longer, and we suggest a room of at least 2.7m x 2.9m for it.
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FAQ's
Is the Flaxby Platinum Eclipse double big enough for a couple?
Yes, with a caveat. The UK double is the traditional couples' size, and each of you gets 67.5cm of width. The independent calico pocket springs help here, reducing the disturbance you feel when a partner moves. If either of you is broad shouldered or a restless sleeper, the UK king's extra 15cm of width is a real comfort upgrade.
What room size do I need for the Platinum Eclipse in a UK double?
We suggest a room of at least 2.6m x 2.8m, with around 3m x 3m the comfortable norm. That allows walking space on both sides and room for bedside tables. Given the Platinum Eclipse is a substantial 35cm deep mattress, a room at the tighter end will feel fuller than the floor plan suggests.
Will the Flaxby Platinum Eclipse double get up narrow stairs?
It should be manageable, but plan ahead. This is a heavy, 35cm-deep mattress with no foam, so it won't fold or flex the way rolled mattresses do. At 135cm wide the UK double turns tight landings and terraced-house staircases more easily than a UK king would, which is one practical reason couples in older homes choose it.
Should I get the Flaxby Platinum Eclipse in a double or a king?
Go by your room. The UK double is 15cm narrower and 10cm shorter than the UK king, and it suits rooms where a king would dominate. If you're tall, the extra 10cm of length in the UK king matters more than the width. If your room measures under our suggested 2.7m x 2.9m for a king, the UK double is the sensible pick.
How big is the Flaxby Platinum Eclipse in a UK double?
It measures 135 x 190cm, or 4ft 6in x 6ft 3in, with a depth of 35cm. That depth is worth checking against your existing fitted sheets, as standard double sheets don't always stretch over a mattress this deep. Extra-deep double bedding is widely available and inexpensive.