Flaxby Platinum Eclipse Mattress
Mattress
Flaxby Platinum Eclipse Mattress
Size
Firmness
Construction
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.
- Room to sleep apart, together: At 15cm wider than the UK double, this size gives each of you space to settle without negotiating elbows.
- Springs that keep movement local: Handsewn calico pocket springs move independently, so a partner leaving for an early shift is far less likely to wake you.
- Extra length for taller sleepers: At 200cm, the UK king is 10cm longer than the UK double, a real relief if either of you is nearing six foot.
- Natural fibres across the full width: Wool, cashmere, alpaca and silk breathe well, so two bodies sharing one surface generate less trapped heat overnight.
- Fits most master bedrooms: We suggest allowing at least 2.7m x 2.9m, achievable in many UK master bedrooms once wardrobes and bedside tables are in place.
This size suits you if...
You share the bed every night and a double has started to feel like a compromise, with one of you disturbed each time the other turns. Or one of you is tall enough that feet reach the end of a standard-length mattress, and the 200cm length matters more than the width. It also suits couples on different schedules who want the pocket springs' motion isolation to have room to do its work.
Consider another size if...
Your bedroom falls short of the 2.7m x 2.9m we suggest for a UK king, or you sleep alone and the width would go unused. We'd recommend the UK double instead, which needs a smaller room at 2.6m x 2.8m.
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Is a UK king big enough for a couple on the Flaxby Platinum Eclipse?
Yes, comfortably for most. The UK king gives 75cm each for two people sharing, and the calico pocket springs respond to each sleeper separately, so one person shifting or getting up disturbs the other less. If you both spread out or share with a pet, the UK super king is the next step up.
Will the UK king Flaxby Platinum Eclipse suit a tall sleeper?
This is where the UK king quietly helps. At 200cm long, it's 10cm longer than the UK double, which stops feet hanging off the end for anyone approaching six foot. The firm support runs the full length, so taller back and front sleepers get consistent support from shoulders to heels.
What room size do I need for a king size Platinum Eclipse?
We suggest at least 2.7m x 2.9m, which leaves walking space around the bed once furniture is in. That's our guidance, not Flaxby's. New build master bedrooms can be tighter than they first appear once fitted wardrobes go in, so measure the usable floor rather than the room on the plan.
Should I get the Platinum Eclipse in a king or a super king?
The UK king suits couples who want more space than a UK double without a super king's room demands. The UK super king is 30cm wider, the same length, and needs at least 3m x 2.9m by our guidance. If a dog routinely joins you, that extra 30cm is the difference.
How do I find the best price on the UK king Platinum Eclipse?
This is a luxury mattress, so it pays to check. The prices shown on this page are updated as retailers change them, so compare the retailers listed here rather than relying on a figure you saw last month. Make sure any listing you compare is specifically the UK king, 150 x 200cm.