Silentnight UltraGel 1000 pocket King Size Mattress
The Silentnight UltraGel 1000 Pocket is a hybrid mattress that pairs a gel infused foam comfort layer with 1000 Mirapocket springs.
- Breathable gel foam runs cooler
- Minimises partner disturbance
- 60-night trial & 5-year guarantee
£627.06
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Silentnight UltraGel 1000 pocket Mattress
More available sizes
Mattress details
Mattress
Silentnight UltraGel 1000 pocket Mattress
Size
Firmness
Medium Firm
Construction
Foam
Pocket Spring
Hybrid
Memory Foam
Gel
Depth (cm)
28
Layers
2
Layer Details
UltraGel comfort layer
A gel infused foam layer that responds to your movements, which means you get contouring without the slow, sunken feel some foams have. Silentnight says it's 5x more breathable than standard memory foam, so it should run cooler through the night.
Mirapocket springs
1000 Mirapocket springs, each held in its own fabric pocket so they respond independently to your body. In practice that means zoned support, better spinal alignment and less motion transfer across the bed.
Layer details from silentnight.co.uk product page, September 2026.
Key benefits
- Space that works with the springs: The pocket springs respond independently to each sleeper, and at 150cm wide there's enough distance between you for that to be felt every night.
- Different schedules, less disturbance: If one of you gets up hours before the other, the individually pocketed springs plus 75cm each for two people sharing keep early alarms from waking the late riser.
- Length for taller sleepers: At 200cm, the UK king is 10cm longer than the UK double, which means anyone approaching six foot stops sleeping with their feet at the edge.
- Cooler across a bigger surface: The UltraGel layer, which Silentnight states is 5x more breathable than standard memory foam, means two bodies on one mattress generate less trapped heat.
- Room to shop around: The UK king is a widely stocked size, so compare the retailers listed on this page, as the prices shown here are updated as retailers change them.
This size suits you if...
You share the bed every night and a double has started to feel cramped, especially with a medium firm feel that keeps you sleeping on the surface rather than sinking away from each other. It also suits couples on mismatched schedules who want the pocket springs' motion isolation to do its job, and taller sleepers who need the 200cm length more than they realise.
Consider another size if...
Your bedroom falls under our suggested minimum of 2.7m x 2.9m, or you sleep alone. For a solo sleeper, the UK double would suit you better; allow at least 2.6m x 2.8m for that size.
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FAQ's
Is the Silentnight UltraGel 1000 in a UK king big enough for a couple and a dog?
Usually, yes. At 150 x 200cm you get 75cm each for two people sharing, and a dog that claims the foot of the bed eats into that less than it would on a double. If your dog is large and sleeps between you rather than at your feet, the UK super king is 30cm wider and worth considering.
Does a king size reduce partner disturbance on this mattress?
It helps in two ways. The 1000 Mirapocket springs sit in individual pockets, so movement on one side barely travels across the bed. The UK king then adds physical distance: at 15cm wider than the UK double, a restless partner or an early alarm is simply further away from you.
Will the UK king version suit someone over six foot?
It's the more likely fit. The UK king runs to 200cm long, 10cm more than the UK double, so a sleeper around six foot gains clearance at both ends. The medium firm feel also keeps taller, heavier frames supported along the spine rather than letting hips dip.
What room size do I need for this mattress in a UK king?
We suggest at least 2.7m x 2.9m, with more feeling comfortable once wardrobes and drawers go in. New build master bedrooms can be tighter than they first appear, so measure with furniture in place. If the room falls short, the UK double needs at least 2.6m x 2.8m by our guidance.
Should I get the UK king or the UK super king in the Silentnight UltraGel 1000?
The UK super king is 30cm wider; both sizes are the same 200cm length, so length shouldn't sway you either way. If your room meets our suggested 3m x 2.9m minimum for the UK super king and you want maximum personal space, size up. Otherwise the UK king is the easier fit for most bedrooms.