Sealy Ortho Plus Gold Super King Mattress
The Sealy Ortho Plus Gold is a firm, double-sided mattress built around Sealy's PostureTech CS springs, which respond to your body weight to give deeper support where you carry the most pressure.
- Extra lumbar support at the centre
- Firm edges, no roll-off feeling
- Double-sided for a longer life
£679
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Sealy Ortho Plus Gold Mattress
More available sizes
Mattress details
Mattress
Sealy Ortho Plus Gold Mattress
Size
Firmness
Firm
Construction
Foam
Memory Foam
Orthopaedic
Depth (cm)
29
Layers
3
Layer Details
Cover
A breathable Belgian damask fabric cover, which means air can move through the sleep surface rather than getting trapped. That helps if you tend to run warm at night.
Comfort Fillings
100% polyester fillings that offer good recovery and durability. In practice that means the comfort layer springs back into shape rather than developing body impressions quickly.
Support System
PostureTech CS springs respond to your body weight, targeting key areas to give deep-down support where you need it most. The springs are twice tempered, a heat treatment that helps them keep their tension over time.
Layer details from mattressnextday.co.uk product page, September 2026.
Key benefits
- Distance beats any comfort layer: With 90cm each for two people sharing, a partner who fidgets or turns all night is simply further away, and far easier to sleep through.
- Room for the whole household: If children pad through at 3am or a large dog treats the bed as routine, 6ft of width means everyone still gets a share.
- Firm support across the full width: The PostureTech CS springs give the same firm, responsive support at the far edges as the middle, so nobody ends up on a soft strip.
- EdgeGuard matters more at this scale: A high-density foam strip firms up the sides, which means the outer inches of that 180cm width are usable sleeping space rather than roll-off territory.
- Double-sided for longer life: Because it's turnable, wear spreads across two sleep surfaces, although flipping a mattress this size is realistically a two-person job.
This size suits you if...
You share the bed every night and want real separation from a restless partner, your children or pets regularly join you and a UK king feels crowded, or you have a large master bedroom where a smaller mattress would look undersized. Allow at least 3m x 2.9m of floor space, with more feeling comfortable.
Consider another size if...
Your bedroom falls short of our suggested 3m x 2.9m minimum, or you'd rather not wrestle a mattress this large when turning it. We'd recommend the UK king instead: it's 30cm narrower, the same length, and needs at least 2.7m x 2.9m.
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FAQ's
How big is the Sealy Ortho Plus Gold in a UK super king?
It measures 180 x 200cm, or 6ft x 6ft 6in. That's the largest size the Ortho Plus Gold comes in, and it gives two people sharing 90cm of width each, the same as a UK single per person.
What room size do I need for a super king Sealy Ortho Plus Gold?
We suggest at least 3m x 2.9m. That's our guidance rather than Sealy's, and it's a minimum: you'll want space to open wardrobe doors and walk round both sides. Measure the door swing and any landing turns too, because a mattress this size tests both.
Is the Sealy Ortho Plus Gold super king hard to flip?
It's a double-sided mattress designed to be turned, and at 180 x 200cm that's genuinely a two-person job. If you're happy to do it, flipping evens out wear over the years. If nobody in the house can help, the smaller UK king would be more manageable.
Is a super king Sealy Ortho Plus Gold good for a restless partner?
It's one of the strongest reasons to buy this size. With 90cm each, movement on one side travels less noticeably to the other, and the firm PostureTech CS springs don't have the bouncy, wallowing feel that transmits every turn. Distance does more here than any comfort layer could.
Should I choose the UK king or the super king?
The UK super king is 30cm wider than the UK king and the two are the same length, so the decision is purely about width and room size. If children or pets share regularly, the extra 30cm is the difference between cosy and cramped. For the UK king, allow at least 2.7m x 2.9m.