Relyon Ortho Superior Extra Firm 1500 Mattress
Mattress
Relyon Ortho Superior Extra Firm 1500 Mattress
Size
Firmness
Extra Firm
Construction
Depth (cm)
32
Layers
3
Layer Details
- Belgian Damask Viscose Sleep Surface. A silky, breathable damask cover that lets air move through the sleep surface. In practice, this means a fresher, less clammy feel through the night.
- Cotton. A natural filling that helps regulate body temperature, so you're less likely to wake up too warm. It also adds a layer of support and natural comfort above the springs.
- 1500 Pocket Springs. Each of the 1500 springs sits in its own fabric pocket, working independently of its neighbours. This means the mattress contours to your body and relieves pressure rather than moving as a single unit.
Layer details from mattressnextday.co.uk product page, September 2026.
- 90cm of space each: Two people sharing get 90cm apiece, which means a fidgeting partner is simply further away, and distance settles disturbance better than any comfort layer can.
- Pocket springs that ignore your partner: Each of the 1500 springs moves independently, which means when someone turns over on their side of 180cm, you feel very little of it on yours.
- Room for night-time visitors: When a child pads in at 3am, or a large dog treats the bed as routine, everyone still keeps a workable share of the width.
- A clear step up from the UK king: The UK super king is 30cm wider than the UK king at the same length, giving each sleeper 15cm more to spread into.
- Cooler across a big surface: Cotton fillings and a breathable damask cover help the whole 180cm width stay fresh rather than clammy, useful when three bodies end up in one bed.
This size suits you if...
You share the bed every night with a restless partner and want distance rather than a softer surface to solve it, or children and pets regularly join you and a UK king has started to feel crowded. You both sleep on your back or front, prefer a properly solid feel, and have a bedroom of at least 3m x 2.9m to give the bed breathing room.
Consider another size if...
Your bedroom is under 3m x 2.9m, or your stairs and landing have tight turns this flat-delivered mattress won't make. We'd recommend the UK king instead: 30cm narrower, the same length, and it suits rooms of at least 2.7m x 2.9m.
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Is a UK super king worth it if my partner is a restless sleeper?
This is arguably the strongest reason to choose one. The 1500 pocket springs already isolate movement well, but 90cm of width each means most of your partner's turning happens too far away to register. On the UK king you'd have 75cm each, so the UK super king buys you 15cm more distance apiece.
Can I get the Relyon Ortho Superior super king up my stairs?
This needs checking before you order. The mattress is delivered flat rather than rolled, so you're moving a rigid 180 x 200cm, 32cm deep block through your house. Measure the staircase width, any landing turns and the bedroom door swing first. If the route is tight, a UK king is 30cm narrower and noticeably easier to manoeuvre.
Is the super king big enough for a family sharing with children?
It's the best mainstream size for it. With 180cm of width, a child wandering in at night still leaves both adults a reasonable share, where the same visit on a UK double or UK king means someone ends up on the edge. The extra firm surface also stays supportive rather than dipping when a third body climbs aboard.
How much bigger is the super king than the king in this mattress?
The UK super king is 30cm wider than the UK king, and both are 200cm long, so the gain is entirely in width: 90cm each for two sharing against 75cm on the UK king. The room requirement grows with it, though. We suggest at least 3m x 2.9m for the UK super king, against 2.7m x 2.9m for the UK king.
Where can I buy the Relyon Ortho Superior Extra Firm 1500 in a super king?
Compare the retailers listed on this page. The prices shown here are updated as retailers change them, so check back if you're weighing up timing. Because this size is at the top of the range, it's the most expensive of the five, so a fresh comparison before you commit is sensible.