Arthur Sleep Cool Memory Super King Mattress
The Arthur Sleep Cool Memory Mattress is a hybrid with a medium firm feel, which means you get the contouring of foam with the support of springs underneath.
- Cooling gel foam for warm sleepers
- Suits back & combination sleepers
- Foam comfort over spring support
£435
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Arthur Sleep Cool Memory Mattress
More available sizes
Mattress details
Mattress
Arthur Sleep Cool Memory Mattress
Size
Firmness
Medium Firm
Construction
Pocket Spring
Hybrid
Memory Foam
Depth (cm)
Layers
4
Layer Details
Gel foam
A cooling, breathable gel foam that cradles you in a similar way to memory foam. It sits at the top, so it is the layer that manages heat first and gives the mattress its softer surface feel.
Memory foam
A memory foam layer that works with the gel foam above it to add support and comfort. It helps the surface ease around your body rather than pushing back against it.
Comfort foam
A high-resilience convoluted foam comfort layer, there for pressure relief. It adds a bit of bounce between the softer foams and the springs below.
800 pocket springs
Individually fabric-wrapped pocket springs that give targeted support and help isolate motion. Because each spring works on its own, you should notice less of a partner's movement across the bed.
Layer details from arthursleep.co.uk and mattressman.co.uk product pages, October 2026.
Key benefits
- Space enough to ignore a restless partner: With 90cm each for two people sharing, movement on one side of the bed rarely carries across to the other.
- Room for company: When a child pads in at 3am, or the dog treats the bed as home, the extra width means nobody ends up clinging to an edge.
- Cooling matters more on a shared bed: Two bodies generate more heat than one, and the gel foam top layer is designed to draw that warmth away rather than trap it.
- 30cm wider than a UK king: The UK super king adds 30cm of width over the UK king at the same length, which is the difference between adequate and genuinely spacious.
- A large size without the large-size price bracket: Arthur Sleep sits at the affordable end of the hybrid market, so scaling up to the biggest mainstream size stings less than it might.
This size suits you if...
You share the bed every night and one of you is a light sleeper, or your household includes children or pets who join you more often than not. It also makes sense if you have a larger master bedroom where a UK king would look a little lost. Allow at least 3m x 2.9m of floor space before committing.
Consider another size if...
Your bedroom falls short of the 3m x 2.9m we suggest for a UK super king, or the bed only sleeps one or two undisturbed adults. We'd recommend the UK king instead, which is the same length and needs at least 2.7m x 2.9m.
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FAQ's
Is a super king too big for my bedroom?
It might be. We suggest at least 3m x 2.9m for a UK super king, and that is a minimum rather than a comfortable fit. Measure with wardrobes and door swing in mind, because a 180cm-wide frame changes how you move around the room. If the numbers are tight, the UK king needs at least 2.7m x 2.9m.
Is the Arthur Sleep Cool Memory worth buying in a super king for a couple?
If you both sleep on it every night, yes, this is the size where the case is strongest. You get 90cm each for two people sharing, so a partner who turns over often is far easier to sleep through, and the cooling gel foam helps with the extra warmth two people produce. Lightweight side sleepers should still note the medium firm feel.
Will the Arthur Sleep super king get up my stairs?
This is the size where stairs, landings and door frames genuinely bite, and Arthur Sleep doesn't publish detail on how this mattress is delivered or whether it arrives compressed. Measure any tight turns on the route to the bedroom before ordering, and check the retailer's delivery information for this specific size.
How does the super king compare to the UK king for this mattress?
The UK super king is 30cm wider than the UK king, and the two are the same length. The feel of the mattress is identical, so the choice comes down to floor space and how much distance you want between sleepers. For couples who share with children or pets, that extra 30cm is usually the deciding factor.
Where can I buy the Arthur Sleep Cool Memory super king?
Availability for this size is limited, so compare the retailers listed on this page rather than expecting to shop around widely. The prices shown here are updated as retailers change them, which matters at the largest size, where any discount is worth more in cash terms than it would be on a smaller mattress.