Silentnight UltraGel 1400 Pocket Mattress
Mattress
Silentnight UltraGel 1400 Pocket Mattress
Size
Firmness
Firm
Construction
Depth (cm)
29
Layers
2
Layer Details
- UltraGel™ layer. A gel infused comfort layer that Silentnight describes as smart and responsive, designed to adapt to your movements. In practice that means comforting, soothing cushioning at the surface rather than a deep sink.
- Mirapocket® springs. 1400 individual pocket springs that adjust to your body weight, giving ease of movement and zoned support. Silentnight states this zoning is scientifically proven to improve spinal alignment and posture.
Layer details from silentnight.co.uk product page, September 2026.
- Proper space for two: With 75cm each for two people sharing, you can both stretch out rather than negotiating elbow room every night.
- Less disturbance from a restless partner: The 1400 Mirapocket springs move individually, which means one of you getting up at 5am is less likely to wake the other.
- Length for taller sleepers: At 200cm long, the UK king is 10cm longer than the UK double, which matters once one of you is approaching six foot.
- A firm, stable surface across the full width: The firm feel keeps you sitting on top of the mattress, so the edge of your 75cm still feels usable rather than saggy.
- Easy to shop around: UK king is a widely stocked size for this mattress, so compare the retailers listed on this page before you buy.
This size suits you if...
You share the bed every night and a double has started to feel tight, especially if one of you shifts position a lot or keeps different hours. It also fits if either of you is tall, since the 200cm length gives welcome breathing room over a standard double. And if the dog has claimed a permanent spot at your feet, the extra width stops that becoming a nightly turf war.
Consider another size if...
Your bedroom falls short of the 2.7m x 2.9m we suggest for a UK king, or you sleep alone. In either case we'd recommend the UK double instead, which needs at least 2.6m x 2.8m.
Similar Mattresses in This Price Range
Did you know? On Mattress Unboxed we have over 1,000 different mattresses to suit all types of sleepers. View all mattresses.
Is the Silentnight UltraGel 1400 in a UK king big enough for two adults?
Yes, comfortably for most couples. At 150 x 200cm you get 75cm each for two people sharing, and the firm surface holds its shape across the full width, so neither of you drifts into the other's half. If you both like to sprawl, the UK super king is 30cm wider.
Will a UK king UltraGel 1400 fit in my bedroom?
We suggest a room of at least 2.7m x 2.9m for a UK king, which leaves space to walk round the bed and open drawers. New build master bedrooms can be tighter than they look once wardrobes go in, so measure with furniture in place before ordering.
Does the UK king size help if my partner gets up earlier than me?
It helps on two fronts. The 1400 pocket springs compress individually, so movement on one side transfers less to the other, and the width of a UK king gives that movement more distance to fade. If your mornings run hours apart, this size is a sensible choice.
Is this mattress long enough for someone over six foot?
In a UK king, yes for most people. The 200cm length is 10cm more than a UK double, which is often the difference between feet on the mattress and feet hanging off it. Anyone unusually tall gets the same 200cm in the UK super king, just with more width.
Should I get the UltraGel 1400 in a UK king or a UK super king?
The UK king suits most couples: plenty of space without dominating the room. The UK super king is 30cm wider at the same length, but we suggest allowing at least 3m x 2.9m for it. If children or pets regularly join you, that extra width is where sizing up pays off.