Arthur Sleep Gel Arthur King Size Mattress
The Gel Arthur from Arthur Sleep is a medium-feel hybrid that pairs gel foam comfort layers with 800 pocket springs, which means you get some cushioning at the surface without losing the supportive, slightly bouncier feel that springs bring.
- Gel foam draws heat away
- Minimises partner disturbance
- 60-night trial & 10-year guarantee
£519
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Arthur Sleep Gel Arthur Mattress
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Mattress details
Mattress
Arthur Sleep Gel Arthur Mattress
Size
Firmness
Medium
Construction
Foam
Pocket Spring
Hybrid
Gel
Depth (cm)
27
Layers
2
Layer Details
Comfort Layer
A combination of gel foam and comfort foam sits at the surface, which means gentle pressure relief with the gel working to draw heat away from you. It gives the mattress its medium feel.
Support System
Beneath the foam sit 800 pocket springs, each moving independently, which means the mattress responds to your shape rather than the whole surface dipping. This also helps limit disturbance from a restless partner.
Layer details from arthursleep.co.uk product page, September 2026.
Key benefits
- Proper space for two: At 150cm wide the UK king gives you 75cm each for two people sharing, enough to change position without negotiating.
- Springs that quieten a restless partner: The 800 pocket springs compress individually, which means an early riser slipping out at 5am causes less of a ripple across the extra width.
- Length for taller sleepers: The UK king is 10cm longer than the UK double at 200cm, a genuine relief if one of you is approaching six foot.
- Gel foam across a bigger surface: The gel layer works to draw heat away, which matters more when two bodies share the bed all night.
- Standard king bedding fits: At 27cm deep it sits under regular king fitted sheets, so upgrading from a double means new sheets, nothing specialist.
This size suits you if...
You share the bed every night and a double has started to feel like a compromise, especially if one of you gets up hours before the other. It also makes sense if either partner is tall, since the 200cm length removes that feet-off-the-end problem, or if a dog has quietly claimed a share of the mattress and you'd like your side back.
Consider another size if...
Your bedroom is smaller than the 2.7m x 2.9m we suggest for a UK king, or you sleep alone. The UK double would suit you better, and we suggest at least 2.6m x 2.8m of room for it.
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FAQ's
Is the Gel Arthur in a UK king good for couples?
Yes, within limits. The UK king gives 75cm each for two people sharing, and the 800 pocket springs limit motion transfer when a partner moves or gets up early. The medium feel suits average-weight back and side sleepers, although heavier couples may find the spring count a little light on support over time.
Will a UK king Gel Arthur fit in my bedroom?
The mattress measures 150 x 200cm, and we suggest a room of at least 2.7m x 2.9m so you can walk round the bed and open drawers. In a new build master, measure after the wardrobes go in; these rooms often have less floor space than they first appear to.
Is the Gel Arthur king long enough for tall sleepers?
At 200cm, the UK king is 10cm longer than the UK double, which is often the difference between feet hanging off the end and lying flat comfortably. If either of you is approaching six foot, the extra length is arguably a bigger upgrade than the extra width.
How much wider is the king than the double Gel Arthur?
The UK king is 15cm wider than the UK double, and 10cm longer too. Spread across two sleepers, that width is enough to feel every night, particularly if one of you props pillows to get comfortable during pregnancy or while recovering from an injury.
Where can I buy the Gel Arthur mattress in a UK king?
Compare the retailers listed on this page. The prices shown here are live and updated as retailers change them, so it's worth checking back before you commit, as budget hybrids like this one are discounted fairly often.