MattressNextDay Ortho Support Foam Super King Mattress
The MattressNextDay Ortho Support Foam Mattress is an extra firm, all-foam orthopaedic mattress made in the UK.
- Extra-firm feel suits heavier builds
- Helps keep your spine aligned
- 5-year guarantee
£429
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MattressNextDay Ortho Support Foam Mattress
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Mattress details
Mattress
MattressNextDay Ortho Support Foam Mattress
Size
Firmness
Extra Firm
Construction
Foam
Rolled
Orthopaedic
Depth (cm)
20
Layers
2
Layer Details
Knitted Cover
A soft knitted cover that's breathable, which means heat can escape rather than build up around you. It helps keep you at an even temperature all night.
Reflex Foam
Reflex foam is a dense, responsive foam that conforms to the shape of your body. It offers tailored support to help improve your spinal alignment and posture.
Layer details from mattressnextday.co.uk product page, September 2026.
Key benefits
- 90cm each for two sharing: Each of you gets 90cm of width, so a partner who shifts position through the night becomes far easier to sleep through.
- Extra firm support across the full width: The dense reflex foam keeps its solid feel edge to edge, which means neither sleeper rolls towards the middle even on a bed this wide.
- Space for children and pets: When a child wanders in at 3am or a large dog treats the bed as theirs, 180cm of width means everyone still keeps a workable share.
- A firm base at family scale: The unyielding surface holds up well under the combined weight of a household piling on, where softer mattresses can bow in the middle.
- No sink-in feel to fight against: Reflex foam responds quickly rather than cradling you, so moving across a bed this large takes little effort compared with slow-recovery memory foam.
This size suits you if...
You share the bed every night with a restless partner and want distance rather than clever motion isolation, or children and pets regularly join you and a UK king has started to feel crowded. You'll also need a firm preference on both sides of the bed, because this mattress is extra firm across its full width, and a room of at least 3m x 2.9m to take it comfortably.
Consider another size if...
Your bedroom is under our suggested 3m x 2.9m minimum, or a bed this wide would crowd your wardrobes and door swing. The UK king is 30cm narrower and the same length, with 75cm each for two sharing; we'd recommend it instead, and it needs at least 2.7m x 2.9m.
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FAQ's
What room size do I need for a super king ortho mattress?
Allow at least 3m x 2.9m, with around 3.5m x 3.2m feeling more comfortable. That's our own guidance, and it accounts for walking space and drawers, though check your door swing too, as a 180cm wide bed can sit closer to the door than you expect.
Is the MattressNextDay Ortho Support Foam Mattress in a super king good for couples?
Yes, particularly if one of you is restless. With 90cm each, movement on the other side is simply further away, and the extra firm reflex foam doesn't transfer a soft, wobbly feel. Both of you need to like a very firm surface, though; there's no plush side.
Will a super king foam mattress get up my stairs?
This is a one-piece 180 x 200cm foam mattress rather than zip and link halves, so measure your stairwell and any landing turns before ordering. Foam flexes more than a sprung mattress, which helps on tight corners, but at 6ft wide it's still an awkward carry.
How much wider is a super king than a king?
The UK super king is 30cm wider than the UK king, and both are the same 200cm length. Two people sharing get 90cm each on the UK super king against 75cm each on the UK king, which is 15cm more each, a difference you notice most with a restless partner.
What bedding fits this mattress in a super king?
You'll need super king sheets sized for 180 x 200cm, and we'd suggest a 260 x 220cm duvet. Bedding at this size costs more than king equivalents, so factor that into your budget alongside the mattress itself when comparing the retailers listed on this page.