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.
- 75cm each for two sharing: You each get 75cm of width, which means you can settle into your own side without negotiating territory through the night.
- Pocket springs limit partner disturbance: Each of the 1500 springs moves independently, so an early alarm and a quiet exit on one side is less likely to wake the other.
- 200cm of length for taller sleepers: The UK king is 10cm longer than the UK double, which means anyone approaching 6ft finally gets their feet on the mattress rather than off the end.
- A firm surface across the full width: The extra firm build stays supportive right to the edges, useful if getting in and out of bed matters, during recovery or later in pregnancy.
- Cotton fillings across a bigger bed: Two people sharing generate more heat than one, and the cotton fillings help the larger surface stay temperate rather than clammy.
This size suits you if...
You share the bed every night and have outgrown a UK double, you both prefer a hard, unyielding sleep surface, or one of you is on a different schedule and wants the pocket springs and extra width to keep movement from travelling. It also suits taller couples, since the 200cm length gives anyone near 6ft room to stretch out.
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. In either case we'd recommend the UK double instead, allowing at least 2.6m x 2.8m for the room.
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Is a UK king worth it over a double for the Relyon Ortho Superior 1500?
For couples, usually yes. The UK king is 15cm wider and 10cm longer than the UK double, and the UK double gives 67.5cm each for two sharing, so the UK king gives 7.5cm more each. On a mattress this firm you tend to sleep in position rather than sink in, so usable width matters.
What room size do I need for the Relyon Ortho Superior in a UK king?
We suggest at least 2.7m x 2.9m, with 3.2m x 3.2m comfortable. That's our own guidance, not Relyon's. New build master bedrooms can shrink fast once fitted wardrobes go in, so measure the finished floor space with furniture in place rather than trusting the plan.
Will the king size fit up my stairs, given it's delivered flat?
This mattress arrives flat rather than rolled, and a 150 x 200cm, 32cm deep extra firm mattress is a substantial object to manoeuvre. Measure your staircase, landing turns and door frames before ordering. If access is tight, that's a practical reason to think carefully, not a reason to size down on the bed itself.
Does a UK king help if my partner gets up earlier than me?
It helps on two fronts. The 1500 pocket springs respond independently, so movement on one side travels less, and 75cm of width each means the person getting up isn't climbing past the person staying asleep. If disturbance is your main frustration, the width upgrade does more than a firmer feel alone would.
Should a taller sleeper pick the UK king or the UK super king?
Length won't decide it: the UK king and the UK super king are the same 200cm. The difference is width, with the UK super king 30cm wider at 90cm each for two sharing. If your room allows at least 3m x 2.9m and you want maximum space, size up; otherwise the UK king covers the height question.