Silentnight UltraGel 1200 Pocket Pillowtop Super King Mattress
The Silentnight UltraGel 1200 Pocket Pillowtop is a medium-feel hybrid that pairs 1200 Mirapocket springs with a gel infused comfort layer, which means you get body-shaping support with a noticeably cooler surface than plain foam tends to offer.
- Plush pillow top with cooling gel
- Minimises partner disturbance
- 60-night trial & 5-year guarantee
£884.17
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Silentnight UltraGel 1200 Pocket Pillowtop Mattress
More available sizes
Mattress details
Mattress
Silentnight UltraGel 1200 Pocket Pillowtop Mattress
Size
Firmness
Medium
Construction
Pocket Spring
Hybrid
Gel
Depth (cm)
28
Layers
3
Layer Details
UltraGel layer
A gel infused layer that responds to your movements and provides a cooling sensation. In practice, that means the surface should feel less heat-retentive than standard foam.
Pillowtop
A plush pillowtop sewn on top for extra comfort and pressure relief to soothe aches and pains. This is what gives the mattress its softer initial feel before you reach the support layers.
Mirapocket springs
1200 Mirapocket springs provide zoned support, with each individual pocket spring adjusting to your body weight. That translates to ease of movement and a more undisturbed night's sleep if you share the bed.
Layer details from silentnight.co.uk product page, September 2026.
Key benefits
- 90cm each for two sharing: With 90cm of width apiece, each of you sleeps on the equivalent of your own single-bed space, so fidgeting on one side rarely carries across.
- Pocket springs suit the extra width: The 1200 individual Mirapocket springs respond to each sleeper separately, which means movement at one edge of this wide surface stays put rather than travelling.
- Room for night-time visitors: If children pad in at 3am or the dog treats the bed as routine, a UK super king absorbs the extra body without anyone perching on an edge.
- Cooler across a shared bed: Two bodies generate more warmth than one, and the gel infused comfort layer is designed to feel less heat-retentive than plain foam, useful at this scale.
- Fills a large master properly: In a period property or generous new build bedroom, a UK king can look undersized; the extra 30cm of width here suits the proportions of a bigger room.
This size suits you if...
You share the bed every night and want the most sleeping space a mainstream UK size offers, your partner is genuinely restless and distance matters more than any comfort layer, or your household includes children or pets who regularly end up in the bed. It also makes sense if your bedroom is large enough that a UK king would look and feel lost in it.
Consider another size if...
Your room falls short of the 3m x 2.9m we suggest as a minimum, or your landing and door swing make a 180cm-wide mattress impractical. We'd recommend the UK king instead: it's 30cm narrower, the same length, and we suggest at least 2.7m x 2.9m for it.
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FAQ's
What room size do I need for a super king Silentnight UltraGel 1200?
We suggest at least 3m x 2.9m. That allows walking space on both sides and room for bedside tables, which most people sharing a bed this size will want. If your bedroom is smaller, the UK king needs at least 2.7m x 2.9m by our guidance and is a more comfortable fit.
How much space does each person get on the UltraGel 1200 super king?
90cm each for two people sharing. Combined with the 1200 pocket springs, which adjust to each body individually rather than moving as one unit, that gap is usually enough to make a restless partner easy to ignore. It also leaves genuine space when a child climbs in during the night.
Is the super king UltraGel 1200 worth it over the UK king?
The UK super king is 30cm wider than the UK king and the same length. If you share with a fidgety partner, or children and pets join you regularly, that extra width is the difference between everyone having space and someone clinging to an edge. In a room under our suggested 3m x 2.9m minimum, the UK king is the wiser buy.
Will a super king UltraGel 1200 fit up my stairs?
This is where the size bites. A 180 x 200cm hybrid with a sewn-on pillowtop is heavy and awkward on tight landing turns, and it can't be folded the way some boxed foam mattresses can. Measure your stairwell, any turns and the bedroom door swing before ordering, and check the retailer's delivery access requirements too.
Where can I buy the Silentnight UltraGel 1200 in a super king?
Compare the retailers listed on this page. Prices shown here are updated as retailers change them, so it's worth checking back rather than assuming the first figure you saw still stands. The mattress itself is identical wherever you buy it, so the deciding factors are price and delivery arrangements for a mattress this large.