Silentnight Memory 1400 Pocket King Size Mattress
The Silentnight Memory 1400 Pocket is a hybrid mattress that pairs a memory foam comfort layer with 1400 Mirapocket springs, which means you get pressure relief on top and independent support beneath.
- Firm support for back & front sleepers
- Minimises partner disturbance
- 60-night trial & 5-year guarantee
£556.93
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Silentnight Memory 1400 Pocket Mattress
More available sizes
Mattress details
Mattress
Silentnight Memory 1400 Pocket Mattress
Size
Firmness
Firm
Construction
Foam
Pocket Spring
Hybrid
Memory Foam
Depth (cm)
25
Layers
2
Layer Details
Memory Foam
A memory foam layer that moulds to your body, which means pressure is eased from muscles and joints as you settle in. Expect a gentle cradle rather than a deep sink, given the firm overall feel.
Mirapocket Springs
1400 Mirapocket springs sit beneath the foam, each responding independently to your movement. In practice that means targeted support along your spine and less motion transfer across the bed.
Layer details from silentnight.co.uk product page, September 2026.
Key benefits
- 75cm each for two sharing: Each of you gets 75cm of width, which means you can change position without brushing your partner awake on those independent springs.
- Extra length for taller sleepers: At 200cm long, the UK king is 10cm longer than the UK double, a genuine relief if one of you is nudging six foot.
- Springs that keep movement local: The 1400 Mirapocket springs respond individually, so a partner leaving for an early shift is felt far less across this wider surface.
- Firm support across the full width: The firm feel stays consistent edge to edge, useful if you sleep near your own side rather than the middle.
- Fits most master bedrooms: We suggest allowing at least 2.7m x 2.9m of floor space, achievable in many UK master bedrooms once wardrobes are accounted for.
This size suits you if...
You share the bed every night and a double has started to feel cramped, especially with a firm mattress where you can't sink towards the middle. Or one of you keeps different hours and you want the width, plus the motion isolation of those pocket springs, to stop early alarms waking you both. The 200cm length also suits you if either partner is on the taller side.
Consider another size if...
Your room falls short of the 2.7m x 2.9m we suggest for a UK king. In that case we'd recommend the UK double instead, which needs at least 2.6m x 2.8m and gives up only 15cm of width.
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FAQ's
Is the Silentnight Memory 1400 in a UK king good for couples?
Yes, and arguably it's the size where this mattress makes most sense for two. You get 75cm each for two people sharing, and the 1400 Mirapocket springs limit how much movement travels across that width. The firm feel suits back and front sleepers, although a lightweight side sleeper may still find the shoulder a little unforgiving.
What room size do I need for the UK king Silentnight Memory 1400?
We suggest allowing at least 2.7m x 2.9m so you can walk round the bed and open drawers comfortably. New build master bedrooms often look generous on the plan but shrink once fitted wardrobes go in, so measure the usable floor rather than the room itself before committing to a UK king.
Is a UK king Silentnight Memory 1400 long enough for tall sleepers?
The UK king measures 150 x 200cm, or 5ft x 6ft 6in, and it's 10cm longer than the UK double. That extra length is often the real upgrade for anyone approaching six foot, whose feet hang off a standard 190cm mattress. On a firm surface like this one, having your whole body supported matters.
Should I choose the UK king or the UK super king in this mattress?
The UK king is 30cm narrower than the UK super king, and the two are the same length, so the decision is purely about width and floor space. We suggest at least 3m x 2.9m for the UK super king. If your room can take it and you value space over cost, size up; otherwise the UK king serves most couples well.
Does the UK king reduce partner disturbance on this mattress?
It helps in two ways. The width gives you 75cm each, so a restless sleeper or a dog claiming its usual patch leaves you more undisturbed space. And the 1400 Mirapocket springs compress independently, so movement on one side transfers less to the other. Compare the retailers listed on this page, as prices for the UK king change regularly.