Arthur Sleep Ortho Arthur Super King Mattress
The Ortho Arthur from Arthur Sleep is a pocket spring mattress designed for firm support and restorative sleep, which means individual springs respond to your body rather than the whole surface moving as one.
- Firm support for back & front sleepers
- Cooling gel foam comfort layer
- Hypoallergenic & anti-allergy cover
£755.10
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Arthur Sleep Ortho Arthur Mattress
More available sizes
Mattress details
Mattress
Arthur Sleep Ortho Arthur Mattress
Size
Firmness
Firm
Construction
Pocket Spring
Depth (cm)
Layers
2
Layer Details
Gel foam comfort layer
A gel foam layer sits at the top and forms the comfort layer. It adds a little cushioning over the firm springs below, and the gel is there to help control temperature.
Pocket spring core
The core is made of pocket springs, each housed in its own fabric pocket. That lets the springs move independently, so you get firm support that responds to your body rather than moving as one sheet.
Layer details from arthursleep.co.uk and mattressman.co.uk product pages, October 2026.
Key benefits
- 90cm each for two sharing: Two people each get 90cm of width, so a partner who shifts about at night is far enough away that the movement barely registers.
- Firm support across a wide surface: The Ortho Arthur's firm pocket spring build means the individual springs respond to each sleeper separately, useful across 180cm where two bodies rarely lie the same way.
- Space for wanderers: When a child or a large dog joins you in the small hours, 180cm of width means everyone keeps a share rather than fighting over the middle.
- Fills a large master properly: In a period property or generous new build master, a UK king can look undersized against the wall; the super king holds its own visually.
- Same length as a UK king: At 200cm long, the UK super king and the UK king match, so taller sleepers lose nothing by sizing up in width.
This size suits you if...
You share the bed every night and want enough distance that a restless partner stops being your problem, your children or dog treat your bed as an open invitation, or your master bedroom is large enough that a UK king would look lost in it. The firm feel suits back and front sleepers best, so it helps if that describes at least one of you.
Consider another size if...
Your bedroom is smaller than the 3m x 2.9m we suggest as a minimum, or you'd struggle to get a 180cm mattress round your landing. We'd recommend the UK king instead: 30cm narrower, the same 200cm length, and we suggest at least 2.7m x 2.9m for it.
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FAQ's
Will the Ortho Arthur super king fit in my bedroom?
The mattress measures 180 x 200cm, and we suggest a room of at least 3m x 2.9m so you can walk round the bed and open drawers. Before ordering, check the awkward bits too: door swings, tight landing turns and stair angles catch people out at this size more than the room itself does.
Is the Arthur Sleep Ortho Arthur super king good for couples?
Yes, and space is the reason. With 90cm of width each, a fidgety partner becomes much easier to ignore, and the pocket springs respond to each of you individually rather than moving as one surface. One caveat: it's a firm mattress, so a lightweight side sleeper sharing it may find it slightly solid at the shoulder and hip.
How much bigger is the UK super king than the UK king?
The UK super king is 30cm wider than the UK king, and the two are the same length at 200cm. That extra width is roughly the difference between sensing every turn your partner makes and sleeping through them. It also asks slightly more of the room: we suggest at least 3m x 2.9m for the UK super king against 2.7m x 2.9m for the UK king.
Is a super king worth it if children climb in at night?
If it happens most weeks, yes. At 180cm wide there's room for a small visitor without either adult ending up clinging to the edge, and the firm pocket spring support holds up well with extra weight on the bed. The same logic applies to a large dog who considers your bed part of the routine.
Where can I buy the Ortho Arthur in a super king?
Compare the retailers listed on this page; the prices shown are updated as retailers change them. Stock at the super king size can be patchier than for a UK double or UK king, so if you see it available at a price you're happy with, it's sensible to move rather than wait.