Silentnight UltraGel 3000 Mirapocket Box Top Firmer Super King Mattress
The Silentnight UltraGel 3000 Mirapocket Box Top Firmer is a firm hybrid with a softer story on top.
- Firm feel with a cushioned top
- Extra support under your hips
- Minimises partner disturbance
£1,365
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Silentnight UltraGel 3000 Mirapocket Box Top Firmer Mattress
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Mattress details
Mattress
Silentnight UltraGel 3000 Mirapocket Box Top Firmer Mattress
Size
Firmness
Firm
Construction
Foam
Pocket Spring
Hybrid
Gel
Depth (cm)
35
Layers
4
Layer Details
Pillow top
An additional comfort layer sewn on top, which means a more luxurious, cushioned feel the moment you lie down. It softens the first impression of what is otherwise a firm mattress.
UltraGel
A gel infused foam layer that adapts to your shape and movements, distributing your weight evenly. According to the listing it's five times more breathable than memory foam, so it should hold less heat.
Mini Pocket Springs
A layer of 1,000 mini pocket springs that work like bellows, pushing air through the comfort layers as you move. They also help decrease motion transfer, so you feel less of a restless partner.
Mirapocket Springs
The main support unit of 2,000 Mirapocket springs, zoned so the centre third is firmer. That means greater support under your midsection and encouragement towards better spinal alignment.
Layer details from mattressonline.co.uk product page, September 2026.
Key benefits
- 90cm each: With 90cm of width each, two adults can sleep side by side without brushing elbows, which matters most when one of you shifts about all night.
- Space for extra sleepers: When a child pads in after a bad dream or a large dog settles at the foot, 180cm of width means nobody ends up clinging to the edge.
- Less disturbance from a fidgety partner: Distance does most of the work against a restless partner, and the layer of mini pocket springs reduces the movement that still travels across the mattress.
- A proper step up from the UK king: Compared with the UK king, you gain 15cm each at the same length, so the extra goes entirely into personal space rather than legroom.
- In proportion in a large room: In a generous master bedroom or period property with high ceilings, a UK super king fills the floor in proportion where a UK king can look slightly lost.
This size suits you if...
You share with a partner who tosses and turns, children or a large dog regularly end up in the bed with you, and your bedroom comfortably clears our suggested minimum of 3m x 2.9m.
Consider another size if...
Your bedroom is under 3m x 2.9m, or tight doors and landings make a 180cm wide mattress impractical. We'd recommend the UK king instead, allowing at least 2.7m x 2.9m for the UK king.
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FAQ's
Is the UltraGel 3000 UK super king big enough for two adults and a child?
For occasional visits, yes. Each adult has 90cm of width, so a small child can fit in the middle without anyone being pushed to the edge. If a child joins you most nights, the firm core suits most adults well, although a small, light child may find the surface a little firm compared with their own bed.
How much more room does the UltraGel 3000 super king give than the king?
The UK super king is 30cm wider than the UK king and exactly the same length. Shared between two, that works out at 15cm more each, taking you from 75cm to 90cm. If height is your concern rather than width, sizing up will not help, as both sizes are 200cm long.
Can I fit a Silentnight UltraGel 3000 super king in a loft conversion bedroom?
Possibly, but measure carefully. We suggest at least 3m x 2.9m of floor, and in a loft conversion the sloping ceiling often decides which wall the headboard goes against. At 35cm deep this mattress sits you a little higher than a slimmer one, so check you have sitting headroom where your pillows will be.
Does the UltraGel 3000 super king have more than 3,000 springs?
Silentnight quotes the 3,000 spring count for the kingsize, so the UK super king figure may differ. Check the brand's own details if the exact count matters to you. The zoning, firmer through the centre third to support your hips, follows the same design whichever size you choose.
Is the UltraGel 3000 super king difficult to move around the house?
It can be. Across verified owner reviews, the 35cm depth and weight come up as practical issues, and the mattress is awkward to turn or carry on your own. At 180cm wide, measure door swings and landing turns before ordering, and plan for two people whenever it needs rotating.