Sealy Ortho Support Double Mattress
The Sealy Ortho Support Mattress is available in five UK sizes, from Single up to Super King.
- Extra-firm feel for a flat surface
- Reinforced edges for more usable space
- Hypoallergenic fibre fillings
£615
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Sealy Ortho Support Mattress
More available sizes
Mattress details
Mattress
Sealy Ortho Support Mattress
Size
Firmness
Extra Firm
Construction
Orthopaedic
Depth (cm)
Layers
3
Layer Details
PostureTech 2.0 spring core
Sealy's PostureTech 2.0 smart spring core, made up of pocket springs individually encapsulated in fabric, forms the base of the mattress. It gives the firm support you would expect from an extra-firm build.
EdgeGuard surround
EdgeGuard surrounds the spring system and reinforces the sides and edges. That means you get more usable sleep surface, so you can sleep or sit nearer the edge without it feeling weak.
OptiForm extra-firm foam
A double layer of OptiForm extra-firm foam sits on top of the springs and gently cushions and adapts to your body. Expect a firm, fairly flat feel rather than a deep sink-in one.
Layer details from mattressman.co.uk product page, October 2026.
Key benefits
- The classic shared size: At 135 x 190cm, the UK double is the traditional choice for two, sized for the sort of bedroom most UK homes actually have.
- Space for two, honestly measured: You get 67.5cm each for two people sharing, which is fine for couples who sleep close, although restless pairs may feel it.
- Fits rooms a UK king would crowd: We suggest at least 2.6m x 2.8m, so you can usually keep bedside tables on both sides rather than sacrificing them to the bed.
- Generous for one: A solo sleeper gets the whole 4ft 6in width, which leaves plenty of room to sprawl, or to share with a cat who claims a corner.
- Easy to dress: Double sheets and duvets are sold everywhere at every price, a small saving that matters if you're furnishing a whole home at once.
This size suits you if...
You're a couple in a typical UK bedroom and want a shared bed that still leaves walking space and room for furniture on both sides, you're kitting out a guest room that visiting couples will use, or you sleep alone and want space to stretch out without stepping up to a larger frame.
Consider another size if...
You and your partner are both broad or restless, because 67.5cm each can feel snug night after night. We'd recommend the UK king instead, which is 15cm wider and 10cm longer; allow at least 2.7m x 2.9m for it.
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FAQ's
How big is the Sealy Ortho Support Mattress in a UK double?
It measures 135 x 190cm, which is 4ft 6in x 6ft 3in in old money. That's the standard UK double footprint, so it fits any UK double bed frame and takes standard double sheets and a 200 x 200cm double duvet.
Is the UK double Sealy Ortho Support big enough for two adults?
For most couples, yes. Two people sharing get 67.5cm each, enough if you sleep fairly close or don't move much. If either of you is tall, broad or a restless sleeper, the UK king's extra 15cm of width and 10cm of length makes a noticeable difference.
What room size do I need for a Sealy Ortho Support UK double?
We suggest a room of at least 2.6m x 2.8m. That leaves space to walk round the bed and, in most layouts, keep bedside tables on both sides. In a snug second bedroom or a first flat, the UK double usually leaves room for a wardrobe and drawers too.
Should I choose the Sealy Ortho Support in a UK double or a UK king?
It comes down to your room. The UK double is 15cm narrower and 10cm shorter than the UK king, so it suits bedrooms where a king would dominate. If your room measures at least 2.7m x 2.9m and you share every night, the UK king is the more comfortable long-term choice.
Would a UK double be too big for a solo sleeper?
Not at all. On your own you get the full 135cm width, plenty of space to spread out, and enough left over if a dog or cat routinely takes a corner. If your room is tight, the UK small double is 15cm narrower and the same length, and needs at least 2.4m x 2.8m.