Sealy Ortho Support Single 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
£509
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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
- Fits compact rooms: At 90 x 190cm it leaves floor space free for a desk, wardrobe or toy storage, which matters most in a child's bedroom where the bed competes for every inch.
- Room for two beds: We suggest at least 2.1m x 2.8m for one UK single, so a modest room can often take two with a walkway between, useful for siblings or a twin guest setup.
- Works with raised frames: The UK single is the standard size for bunk, cabin and mid-sleeper frames, though check the frame's maximum mattress depth against the retailer's listing before ordering.
- Cheap, easy bedding: Standard single sheets and a 135 x 200cm single duvet fit, and both are the most widely stocked and lowest-priced bedding of any UK size.
- A sensible spare room choice: In a spare room that spends most of the week as an office, a UK single keeps the desk usable while still giving guests a proper bed.
This size suits you if...
You're buying for a child or teenager, you sleep alone in a smaller room, or you're kitting out a guest room or student flat where the frame is already a UK single. It also suits a loft conversion or box room where anything wider would crowd the space, and it's the right size if the bed is going onto a bunk or mid-sleeper frame.
Consider another size if...
You're an adult who sleeps alone but wants space to stretch, or two of you will share the bed. The UK small double is 30cm wider and the same length; allow at least 2.4m x 2.8m of floor space for it.
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FAQ's
What size is the Sealy Ortho Support Mattress in a UK single?
It measures 90 x 190cm, which is 3ft x 6ft 3in. That's the standard UK single, so it fits any standard single bed frame, including divans, slatted frames and children's beds sold in the UK.
Can I use the Sealy Ortho Support single on a bunk or mid sleeper?
The UK single is the standard size for bunk, cabin and mid-sleeper frames, so the footprint will fit. Raised frames often set a maximum mattress depth for safety rails, though, and Sealy doesn't publish a depth for this model, so check the measurement on the retailer's listing against your frame's guidance first.
What room size do I need for a UK single mattress?
We suggest allowing at least 2.1m x 2.8m of floor space. That leaves room to walk around the bed and open drawers or wardrobe doors. In a child's room it also keeps space free for a desk or toy storage, and under a loft slope the narrow 90cm width helps the bed tuck in.
Will two UK singles fit in a guest room?
Often, yes. Each mattress is 90cm wide, and we suggest at least 2.1m x 2.8m for one UK single, so a reasonably sized guest room can take two with a walkway between. Measure your room first, allowing space to get in and out of both beds comfortably.
Should I buy the Sealy Ortho Support in a UK single or a UK small double?
For a child, teenager or a compact room, the UK single is the practical choice and bedding costs less. If an adult will sleep in it every night, the UK small double is 30cm wider and the same length, which is a noticeable difference in stretching room. We suggest at least 2.4m x 2.8m for the UK small double.