Silentnight Comfort Miracoil Memory King Size Mattress
The Silentnight Comfort Miracoil Memory Mattress is a hybrid, which means it pairs a spring system with memory foam so you get support underneath and a softer, contouring feel on top.
- Body-moulding memory foam comfort
- Zoned Miracoil spring support
- Fits most UK bed frames
£510
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Silentnight Comfort Miracoil Memory Mattress
More available sizes
Last seen for £389 at Silentnight on 23rd June 2026
Mattress details
Mattress
Silentnight Comfort Miracoil Memory Mattress
Size
Firmness
Firm
Construction
Hybrid
Memory Foam
Latex
Depth (cm)
Layers
Layer Details
Cover
Luxurious soft knit cover
Top Layer
Body moulding memory foam
Layer 2
Miracoil zoned spring system
Key benefits
- 75cm each for two sharing: Each of you gets 75cm of width, so a partner who shifts around or props up with pillows doesn't drag you with them.
- Extra length for taller sleepers: At 200cm, the UK king runs 10cm longer than the UK double, a genuine relief if either of you is approaching six foot.
- Memory foam softens early exits: The body moulding memory foam layer cushions movement at the surface, useful when one of you gets up hours before the other.
- Zoned springs across the wider surface: The Miracoil zoned spring system provides the support underneath, so two sleepers of different weights each get held up properly across the full 150cm.
- Fits without swallowing the room: We suggest at least 2.7m x 2.9m for a UK king, which most master bedrooms manage where a UK super king would struggle.
This size suits you if...
You share the bed every night and a UK double has started to feel like a compromise, one of you keeps different hours and wants their exits and entrances to go unnoticed, or someone in the bed is tall enough that 190cm mattresses leave feet at the edge. The dog claiming a corner each night is another perfectly good reason.
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. We'd recommend the UK double instead, which needs a smaller room at 2.6m x 2.8m and still gives a solo sleeper plenty of space.
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FAQ's
Is a UK king big enough for a couple with a restless partner?
At 150cm wide it gives you 75cm each, noticeably more personal territory than a UK double. The memory foam top layer on this Silentnight also absorbs some surface movement, so a partner turning over or getting up early registers less than it would on a firmer, springier surface.
Will the UK king suit someone over six foot?
It's the better choice of the two mid-range sizes. The UK king is 200cm long, 10cm more than the UK double, so a sleeper around six foot gets clearance rather than toes at the edge. If height is your main reason for upgrading, the length matters more than the extra width.
What room size do I need for this mattress in a UK king?
We suggest at least 2.7m x 2.9m, and that's our guidance rather than Silentnight's. Measure with wardrobes and drawers in place, especially in a new build master bedroom, which can feel generous empty and tight once the furniture is in. Leave walking space on both sides of the bed.
How does the UK king compare with the UK super king?
The UK king is 30cm narrower than the UK super king; both are the same 200cm length. The UK super king needs a room of at least 3m x 2.9m by our guidance, so the UK king is the practical ceiling for most British bedrooms. Size up only if the room genuinely allows it.
Where can I check the price of the Silentnight Comfort Miracoil Memory in a UK king?
Compare the retailers listed on this page. The prices shown here are updated as retailers change them, so they're a more reliable guide than any figure written into the text. It's also worth asking the retailer about firmness and depth, as Silentnight doesn't publish full construction details for this model.