Silentnight British Wool 1600 Pocket King Size Mattress
The Silentnight British Wool 1600 Pocket Mattress is a foam-free pocket spring mattress with a Medium feel.
- Natural wool regulates temperature
- Foam-free with natural flame retardants
- 60-night trial & 5-year guarantee
£649
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Silentnight British Wool 1600 Pocket Mattress
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Mattress details
Mattress
Silentnight British Wool 1600 Pocket Mattress
Size
Firmness
Medium
Construction
Foam
Pocket Spring
Wool
Memory Foam
Depth (cm)
29
Layers
4
Layer Details
Tencel™ Lyocell sleep surface
A silky, soft-touch material woven to allow airflow, which means moisture is moved away from you rather than trapped at the surface. You should feel drier through the night as a result.
British Wool Comfort Layer
Flexible, breathable wool from Cheviot sheep that keeps you cool in the summer and warm in the winter. It's a natural temperature regulator, doing quietly what synthetic layers often struggle with.
Platinum comfort layer
Silentnight says this is 10x more breathable than memory foam while offering the same pressure relief. In practice that means a cocooning, cushioned feel without the heat build-up foam can bring.
Mirapocket® springs and mini pocket springs
600 Mirapocket® springs work alongside 1000 mini pocket springs for additional comfort and increased breathability. Pocket springs move independently, which means less disturbance when a partner shifts position.
Layer details from silentnight.co.uk product page, September 2026.
Key benefits
- Real space for two: At 75cm each for two people sharing, you can both change position freely without negotiating for territory in the small hours.
- Less disturbance at different hours: The 600 Mirapocket® springs and 1000 mini pocket springs move independently, which means an early alarm on one side is less likely to wake the other.
- Extra length for taller sleepers: The UK king is 10cm longer than the UK double at 200cm, a genuine relief if one of you is approaching six foot.
- Cool across the full width: British wool and the Tencel™ Lyocell surface regulate temperature naturally, so two bodies sharing the bed are less likely to create a heat problem.
- A medium feel that suits sharing: The Medium firmness works for most couples with differing builds, although anyone wanting a very firm surface may find it slightly too forgiving.
This size suits you if...
You share the bed every night and a double has started to feel cramped, especially if one of you turns often or keeps different hours. It's also the size to pick if one partner is tall, since the 200cm length gives feet somewhere to go, or if the dog has quietly become a permanent fixture and takes more than its share.
Consider another size if...
Your bedroom can't comfortably take it: we suggest at least 2.7m x 2.9m for a UK king. If space is tight, we'd recommend the UK double instead, which needs around 2.6m x 2.8m and is only 15cm narrower.
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FAQ's
How big is the Silentnight British Wool 1600 in a UK king?
It measures 150 x 200cm, which is 5ft x 6ft 6in. Two people sharing get 75cm of width each, and at 29cm deep it should fit most standard king fitted sheets without a struggle.
Is the UK king worth it over the double for this mattress?
For most couples, yes. The UK king is 15cm wider and 10cm longer than the UK double, and with 1,600 pocket springs spread across the wider surface, each of you gets independent support with less motion carrying across. If your room takes it, the extra space is felt every night.
What room size do I need for this mattress in a UK king?
We suggest at least 2.7m x 2.9m, which leaves room to walk round the bed and open drawers. In a new build master that can be tighter than it sounds once wardrobes go in, so measure with furniture in place before committing.
Will a UK king reduce disturbance if my partner gets up earlier than me?
It helps on two fronts. The pocket springs compress independently, so their side moving doesn't drag yours with it, and 75cm of width each means you're less likely to be touching in the first place. If your schedules rarely overlap, this size makes a noticeable difference.
Should I go up to the UK super king instead?
The UK super king is 30cm wider than the UK king, though the two are the same length, and we suggest at least 3m x 2.9m of room for it. If you share with a restless partner or a dog and have the floor space, it's worth considering; otherwise the UK king is the sensible middle ground.