Last seen for £521.55 at Mattress Man on 10th November 2026
Silentnight 1000 Pocket Ortho King Size Mattress
The Silentnight 1000 Pocket Ortho is a pocket spring mattress from one of the UK's biggest sleep brands.
- Firm feel for back sleepers
- Springs move independently
- Hypoallergenic knitted cover
Save with the previous model
Some retailers still sell the earlier version of this mattress for less than the current model's best price.
More available sizes
Last seen for £445.55 at Mattress Man on 1st October 2026
Last seen for £521.55 at Mattress Man on 10th November 2026
Last seen for £626.05 at Mattress Man on 1st October 2026
Last seen for £445.55 at Mattress Man on 10th November 2026
Last seen for £331.55 at Mattress Man on 10th November 2026
Mattress details
Mattress
Silentnight 1000 Pocket Ortho Mattress
Size
Firmness
Firm
Construction
Pocket Spring
Depth (cm)
Layers
3
Layer Details
Soft knit cover
A soft knitted cover with a hypoallergenic finish. It adds a little comfort at the surface and suits you if you want a cover that's gentler on sensitive sleepers.
Eco Comfort fibre filling
Eco Comfort Fibre filling layers sit under the cover and give gentle cushioning. It's a simple, fairly light comfort layer, so expect less sink-in than you'd get from deep foam.
Mirapocket spring core
1,000 individual Mirapocket springs, each working independently to spread weight evenly. This means support follows your shape, and you're less likely to feel a partner move.
Layer details from mattressman.co.uk and dunelm.com product pages, October 2026.
Key benefits
- Room to sleep apart, together: At 75cm each for two people sharing, you can both settle into your own space rather than negotiating a shared middle.
- Independent springs across a wider bed: Each of the 1,000 Mirapocket springs responds separately, which means a partner getting up early transmits less movement across the extra width.
- Length for taller sleepers: At 200cm long, the UK king adds 10cm over the UK double, welcome if either of you is nearing six foot.
- Firm support suits restless nights: The ortho-style feel keeps the surface stable when someone is propping pillows or changing position often, though it won't feel plush.
- A modest room requirement for the space gained: We suggest at least 2.7m x 2.9m, which many UK master bedrooms can manage where a UK super king would crowd them.
This size suits you if...
You share the bed every night and a double has started to feel like a compromise, especially if one of you keeps different hours and gets up while the other sleeps on. It also fits if either partner is tall enough to appreciate the 200cm length, or if you like a firmer, supportive feel rather than a soft, sink-in surface.
Consider another size if...
Your bedroom falls short of our suggested 2.7m x 2.9m minimum, or you sleep alone. We'd recommend the UK double instead, which is 15cm narrower and needs at least 2.6m x 2.8m of room.
Similar Mattresses in This Price Range
Did you know? On Mattress Unboxed we have over 1,000 different mattresses to suit all types of sleepers. View all mattresses.
FAQ's
Is a UK king big enough for a couple with a dog on the bed?
It helps. With 75cm each for two people sharing, a dog claiming the foot or middle of the bed eats into space you can actually spare, which isn't true of a UK double. If the dog is large and permanent, the UK super king is 30cm wider still, though it demands at least 3m x 2.9m of room.
Will the Silentnight 1000 Pocket Ortho king fit a new build master bedroom?
Usually, but measure first. New build masters often look bigger empty than they are once wardrobes go in. We suggest at least 2.7m x 2.9m for a UK king, with more space feeling comfortable. If your room is tighter, the UK double needs at least 2.6m x 2.8m and gives up 15cm of width.
Does the king size reduce partner disturbance on this mattress?
Two things work together here. The 1,000 Mirapocket springs compress independently, so movement doesn't travel across the bed the way it does on a single tensioned surface, and the 150cm width puts more distance between you. If one of you leaves for work hours before the other, that combination matters most.
Is the UK king long enough for someone over six foot?
At 200cm, or 6ft 6in, it suits most tall sleepers, and it's 10cm longer than the UK double. If length is your main reason for upgrading, the UK king already gives you the maximum this mattress offers, since the UK super king is the same length and only adds width.
How much wider is the king than the small double for this mattress?
The UK king is 30cm wider than the UK small double and 10cm longer, a substantial jump for a sharing couple. The small double works for one person or very occasional sharing; at this mattress's firmer, ortho-style feel, two adults sleeping close together every night would find it restrictive.