Silentnight UltraGel 3000 Pocket Firm King Size Mattress
The Silentnight UltraGel 3000 Pocket Firm is a hybrid mattress, which means it pairs pocket springs with a comfort layer rather than relying on foam alone.
- Firm support for back & front sleepers
- Minimises partner disturbance
- Springs contour to your shape
£929.64
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Silentnight UltraGel 3000 Pocket Firm Mattress
More available sizes
Mattress details
Mattress
Silentnight UltraGel 3000 Pocket Firm Mattress
Size
Firmness
Firm
Construction
Pocket Spring
Hybrid
Gel
Depth (cm)
Layers
3
Layer Details
UltraGel comfort layer
A gel-infused comfort layer that Silentnight describes as responding to movement and easing pressure. For you, that means a surface that adjusts as you shift, with some cushioning on top of a firm feel.
Foam layer
A foam layer that Silentnight calls its most breathable foam yet, used together with the gel-infused layer above it. That should help the top of the mattress feel less stuffy as you sleep.
Boxtop
A boxtop that adds a softer, more cushioned finish and works with the springs below to give zoned support. You get a little comfort at the surface, while the firm feel underneath keeps you supported.
Layer details from silentnight.co.uk and mattressonline.co.uk product pages, October 2026.
Key benefits
- Room to settle apart: At 75cm each for two sharing, you get 7.5cm more personal space than the UK double, enough to stop elbows and knees meeting in the night.
- Fewer wake-ups from a partner: Pocket springs move independently, and across a 150cm surface there is more distance between you, so an early riser is less likely to disturb the one still sleeping.
- Extra length for taller sleepers: The UK king is 200cm long, 10cm longer than a UK double, which means your feet stay on the mattress rather than hanging off the end.
- Firm support edge to edge: A firm hybrid keeps back and front sleepers level, and on a wider bed that steady surface gives both partners a stable, even feel across their own half.
- A sensible middle size: You get most of the benefit of a bigger bed without the larger room a UK super king asks for, so it fits many main bedrooms comfortably.
This size suits you if...
You share with a partner and keep waking each other on a UK double, one of you sleeps on their back or front and likes a firm surface, or one of you is tall enough that 190cm leaves your feet over the edge.
Consider another size if...
Your bedroom is smaller than our suggested 2.7m x 2.9m once wardrobes are in. We'd recommend the UK double instead, for which we suggest at least 2.6m x 2.8m.
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FAQ's
Is the Silentnight UltraGel 3000 Pocket Firm UK king big enough for two people?
Yes, for most couples. The UK king gives 75cm each for two sharing, which is 7.5cm more per person than the UK double. If one of you sprawls, or a dog regularly joins you, that space shrinks quickly, and the UK super king at 90cm each may suit you better.
Will my partner's movements wake me on a UK king UltraGel 3000 Pocket Firm?
Less often than on a smaller bed. The pocket springs respond individually, so movement stays close to where it happens, and a UK king puts more distance between you. If one of you gets up hours before the other, that combination makes a quieter exit more likely.
Is the UK king long enough for a tall partner?
At 200cm, the UK king is 10cm longer than the UK double, and the same length as the UK super king. If height is your main reason to upgrade, the UK king gives you the full extra length without asking you to find room for the extra width of a UK super king.
Should I choose the UltraGel 3000 Pocket Firm in a UK king or UK super king?
Go by your room first. We suggest at least 2.7m x 2.9m for the UK king and at least 3m x 2.9m for the UK super king. The UK super king gives 90cm each, 15cm more per person, so it suits restless sleepers who have the floor space.
Is it worth upgrading from a double to this mattress in a king?
For most couples, yes. You gain 15cm of width and 10cm of length over a UK double, which you feel every night. The UK king does need more room: we suggest at least 2.7m x 2.9m, and a new build master bedroom can feel tight once furniture goes in, so measure first.