Silentnight Memory Cool 1000 Pocket King Size Mattress
The Silentnight Memory Cool 1000 Pocket is a hybrid mattress that pairs graphite-infused memory foam with 1000 pocket springs, which means you get that slow, cradling foam feel without quite as much of the heat that traditional memory foam traps.
- Graphite foam draws heat away
- Medium-firm feel suits back sleepers
- 60-night trial & 5-year guarantee
£596.85
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Silentnight Memory Cool 1000 Pocket Mattress
More available sizes
Mattress details
Mattress
Silentnight Memory Cool 1000 Pocket Mattress
Size
Firmness
Medium Firm
Construction
Foam
Pocket Spring
Hybrid
Memory Foam
Depth (cm)
29
Layers
2
Layer Details
Memory Cool™
A graphite-infused memory foam that moulds to your body to relieve pressure, which means less pushback at your hips and shoulders. The graphite actively transfers heat away from you, and Silentnight claims it creates a sleep environment 15% cooler than standard memory foam.
Mirapocket® springs
1000 Mirapocket® springs, each held in its own individual pocket so they respond to every movement independently. In practice that means zoned support where you need it and less of the whole-bed wobble you get with open-coil mattresses.
Layer details from silentnight.co.uk product page, September 2026.
Key benefits
- Space to stop negotiating: With 75cm each for two people sharing, you can both spread out without elbowing, which is the main reason couples move up from a UK double.
- Less disturbance on different schedules: If one of you gets up hours before the other, individually pocketed springs plus 15cm more width than a UK double mean the early riser barely registers.
- Length for taller sleepers: At 200cm the UK king is 10cm longer than the UK double, so anyone approaching six foot stops sleeping with their feet at the edge.
- Memory foam hug without the shared heat: The graphite-infused Memory Cool layer draws warmth away, and in a UK king two bodies aren't pressed close enough to pool heat in the middle.
- Room for the dog too: If a pet claims a corner every night, the extra width means their share comes out of the spare space rather than yours.
This size suits you if...
You share the bed every night and have outgrown a UK double, especially if one of you keeps different hours and you want the pocket springs' motion isolation backed up by genuine distance. It also fits if either of you is approaching six foot and needs the 200cm length, or if a pet routinely joins you and a UK double leaves nobody with enough room.
Consider another size if...
Your bedroom is under our suggested minimum of 2.7m x 2.9m, or you sleep alone. For a tight room we'd recommend the UK double, which needs at least 2.6m x 2.8m; a solo sleeper could go smaller still.
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FAQ's
Is a UK king Silentnight Memory Cool 1000 big enough for a couple?
Yes, comfortably for most. It gives 75cm each for two people sharing, which is 15cm more total width than a UK double. Combined with the 1000 pocket springs, which respond to each sleeper independently, that spacing makes a real difference if one of you fidgets or keeps different hours. Restless sleepers wanting maximum separation could consider the UK super king.
Will the king size Memory Cool 1000 fit my bedroom?
We suggest a room of at least 2.7m x 2.9m for a UK king, with 3.2m x 3.2m feeling comfortable once wardrobes and bedside tables are in. New build master bedrooms can be tighter than they look on the plans, so measure with furniture in mind. If it won't fit, the UK double needs at least 2.6m x 2.8m.
Is the Silentnight Memory Cool 1000 UK king long enough for tall sleepers?
At 200cm, the UK king is 10cm longer than the UK double, and for many taller couples the length is the real reason to upgrade. Anyone approaching six foot gets clearance at the foot of the bed rather than heels hanging off the edge. If length is your issue, note the UK super king is the same length, so sizing up beyond king adds only width.
How much bigger is the king Memory Cool 1000 than the double?
The UK king is 15cm wider and 10cm longer than the UK double. That width goes entirely to personal space, taking you from a squeeze to 75cm each for two people sharing. The mattress itself is identical in feel and construction across sizes; you're paying for room to move, and for couples that is usually the better spend.
Does the Memory Cool 1000 in a king cost much more than smaller sizes?
Prices move regularly, so we won't quote a figure here. Compare the retailers listed on this page instead; the prices shown are updated as retailers change them. As a general pattern, the step from a UK double to a UK king is often smaller than buyers expect, which is part of why king is the UK's most popular upgrade.