Last seen for £1,321.75 at Mattress Man on 10th November 2026
Silentnight UltraGel 3000 Pocket Boxtop Medium Firm Super King Mattress
The Silentnight UltraGel 3000 Pocket Boxtop is a medium firm hybrid, pairing pocket springs with gel comfort material and a boxtop finish, which means you get support underneath with a plumper, more cushioned sleeping surface than a standard flat-top mattress.
- Medium-firm feel suits most sleepers
- Box top softens the first feel
- From a long-established UK name
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 £905.25 at Mattress Man on 27th October 2026
Last seen for £1,092.25 at Mattress Man on 10th November 2026
Last seen for £1,321.75 at Mattress Man on 10th November 2026
Last seen for £905.25 at Mattress Man on 10th November 2026
Last seen for £733.50 at Mattress Man on 27th October 2026
Mattress details
Mattress
Silentnight UltraGel 3000 Pocket Boxtop Medium Firm Mattress
Size
Firmness
Medium Firm
Construction
Pocket Spring
Hybrid
Gel
Depth (cm)
Layers
Layer Details
Key benefits
- Space that outlasts a restless partner: You each get 15cm more than on the UK king, and that extra distance limits how much of a restless partner's tossing and turning reaches your side of the bed.
- Room when the household joins in: At 6ft x 6ft 6in, a small child climbing in at night still leaves both adults a usable strip of mattress, which is the main reason families choose the UK super king.
- Cushioned top across a wide surface: The boxtop runs across the full 180cm width, so whoever ends up in the middle, including a visiting child, lies on the same plump layer as the two outer sleepers.
- The same length as the UK king: The UK super king matches the UK king's 200cm length, so all the extra space goes into width, where two adults plus company actually need it.
- Suits a large room better: In a generous master or period bedroom, a UK super king fills the space in proportion, where a UK king can look slightly lost against a wide wall.
This size suits you if...
You share the bed with a partner whose movement regularly wakes you, children or large dogs find their way in most nights, or your bedroom comfortably clears our suggested minimum of 3m x 2.9m and a smaller bed would look undersized.
Consider another size if...
Your bedroom falls short of 3m x 2.9m, or sloping loft ceilings limit which wall can take the bed. We'd recommend the UK king instead, which needs at least 2.7m x 2.9m.
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FAQ's
Is the Silentnight UltraGel 3000 super king big enough for two adults and a child?
For occasional night visits, usually yes. The UK super king gives each adult 90cm, compared with 75cm each on the UK king, so a small child in the middle still leaves both of you some room. If you co-sleep with a child every night, the UK super king is the size to choose for this mattress.
Silentnight UltraGel 3000 super king or king for a restless sleeper?
If your partner moves a lot, choose the UK super king. It is 30cm wider than the UK king and gives each of you 15cm more space. Pocket springs help limit how far movement travels, but extra distance between you helps more than any comfort layer.
Will a Silentnight UltraGel 3000 super king fit in a loft conversion bedroom?
Floor area is only the first check. We suggest at least 3m x 2.9m, with around 3.5m x 3.2m feeling comfortable, but in a loft the slope of the ceiling decides where the bed can go. Measure the wall with full headroom, and check that the door can swing open and the landing turn leaves room to carry the mattress up.
How much wider is the UltraGel 3000 super king than a double?
The UK super king is 45cm wider than the UK double and 10cm longer. For two people sharing, the UK double gives 67.5cm each and the UK super king gives 22.5cm more each. If you are moving up from a UK double, you will notice the extra width straight away.
Is the Silentnight UltraGel 3000 in super king a good choice if my dog sleeps on the bed?
If a large dog shares the bed as a matter of routine, the UK super king is the size that leaves two adults enough room. The 180cm width means the dog can take the foot or a corner while each of you keeps a reasonable share. Check the live retailer listings on this page for current availability in the UK super king.