MattressNextDay Cashmere Ortho 1000 Pocket British Wool King Size Mattress
The Cashmere Ortho 1000 Pocket British Wool Mattress from MattressNextDay is a firm pocket spring mattress with natural fillings.
- Natural silk, cashmere & wool fillings
- Wool helps regulate temperature
- Minimises partner disturbance
£349
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MattressNextDay Cashmere Ortho 1000 Pocket British Wool Mattress
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Mattress details
Mattress
MattressNextDay Cashmere Ortho 1000 Pocket British Wool Mattress
Size
Firmness
Firm
Construction
Pocket Spring
Wool
Orthopaedic
Natural
Depth (cm)
28
Layers
4
Layer Details
Silk
Soft in texture and light in weight, silk forms the top comfort layer. It gives the sleep surface a gentle, luxurious feel.
Cashmere
A rare filling that is softer and finer than wool, typically found in quality mattresses. It adds a touch of plushness above the firmer layers below.
Authentic Traceable British Wool
This wool is 100% traceable from farm to shop and comes from British Cheviot sheep, known for a strong yet soft fleece. It provides a natural bounce and helps regulate your temperature through the night.
1000 Pocket Springs
Each spring sits in its own fabric pocket, so they work completely independently of one another. That means better pressure-relieving support that responds to your body rather than the whole bed moving at once.
Layer details from mattressnextday.co.uk product page, September 2026.
Key benefits
- Proper space for two: With 75cm each for two people sharing, you can settle into your own side rather than negotiating the middle all night.
- Less partner disturbance at this width: The 1,000 pocket springs move independently, and the UK king's width means an early riser can slip out with less chance of waking you.
- Length for taller sleepers: At 200cm, the UK king is 10cm longer than the UK double, which anyone approaching six foot will feel at their feet.
- Firm support across a wider surface: The firm tension gives back and front sleepers even, solid support, and the bigger surface means neither of you drifts into a shared dip.
- Wool comfort shared without overheating: The traceable British wool layer helps regulate temperature, useful when two bodies are warming one bed all night.
This size suits you if...
You share the bed every night and a double has started to feel cramped, especially since this firm mattress rewards having room to lie flat on your back without a partner pressed against you. It also fits if one of you is tall and keeps running out of length, or if you're on different schedules and want the width to come and go without disturbing each other.
Consider another size if...
Your bedroom can't comfortably take a 150 x 200cm bed, or you sleep alone. We'd recommend the UK double instead, which gives 67.5cm each for two sharing and needs a room of at least 2.6m x 2.8m.
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FAQ's
Is the Cashmere Ortho 1000 in a UK king big enough for two adults?
Yes, comfortably for most couples. The UK king gives 75cm each for two people sharing, which is 7.5cm more per person than the UK double. On a firm mattress like this, that space lets each of you lie flat and supported on your own side, and the independent pocket springs keep one sleeper's movement from travelling across.
What room size do I need for the Cashmere Ortho UK king?
We suggest a room of at least 2.7m x 2.9m for a UK king, with around 3.2m x 3.2m feeling genuinely comfortable. The mattress itself is 150 x 200cm, so measure with wardrobes and bedside tables in place. New build master bedrooms can be tighter than they first appear once the furniture is in.
Should I choose the UK double or UK king Cashmere Ortho 1000?
If you share the bed, the UK king is usually the better buy. It's 15cm wider and 10cm longer than the UK double, which works out at 7.5cm more space each. Solo sleepers, or couples with a room under 2.7m x 2.9m, will find the UK double more sensible.
Is the UK king Cashmere Ortho long enough for someone over six foot?
At 200cm, it gives more clearance than the 190cm UK double, and taller sleepers tend to feel that difference straight away. If you also want more width, the UK super king is 30cm wider at the same length, though it needs a room of at least 3m x 2.9m.
Does a king size make the firm feel any different?
The tension itself doesn't change with size, but the experience of sharing does. A firm mattress with 1,000 independent pocket springs transfers little movement anyway, and at 75cm each the UK king gives you enough distance that a restless or early-rising partner is far less likely to wake you.