Sealy Ortho Plus Bronze Mattress
Mattress
Sealy Ortho Plus Bronze Mattress
Size
Firmness
Construction
Depth (cm)
28
Layers
4
Layer Details
- Knitted Cover. A soft knitted cover that's breathable, which means heat can escape rather than build up. It helps keep you at an even temperature through the night.
- Soft White Fibres. Fibre fillings made from 100% polyester, chosen for recovery and durability. In practice that means the comfort layer springs back rather than flattening quickly.
- PostureTech CS Springs with EdgeGuard. The PostureTech Core Support spring system responds to changes in your sleeping position, targeting support where you need it most. Each spring holds an EdgeGuard high-density foam insert, which strengthens the mattress edges and extends the springs' lifespan.
- PowerPack Core. The PowerPack at the core works with the PostureTech system to keep your lumbar region comfortable and safely aligned. It's the layer doing the deep support work for your lower back.
Layer details from mattressnextday.co.uk product page, September 2026.
- Real width for one sleeper: At 120cm across, you get 30cm more room than a UK single, which means you can change position freely on a surface built for firm support.
- Fits rooms a double crowds: It's 15cm narrower than a UK double, so it works in box rooms and smaller second bedrooms where walkway space is tight; allow at least 2.4m x 2.8m.
- Easier to turn at this size: This mattress is double-sided and needs regular flipping, and a 4ft mattress is noticeably more manageable to turn than a UK king or super king.
- Usable edge across a narrower bed: EdgeGuard foam inserts firm up the sides, which matters more on a 120cm width where you naturally sleep closer to the edge.
- Standard 4ft bedding: The small double is a standard UK size, so frames, fitted sheets and protectors are easy to find on the high street.
This size suits you if...
You're a solo adult who has outgrown a UK single and wants genuine stretching room, your bedroom is too small to take a UK double comfortably, or you're furnishing a guest room where a couple stays occasionally rather than every night. The extra firm feel suits you if you want firm orthopaedic support rather than a soft, cushioned surface.
Consider another size if...
You share the bed every night, because 120cm is a squeeze for two adults long term. We'd recommend the UK double instead, which is 15cm wider and the same length; allow at least 2.6m x 2.8m for it.
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Is a small double Sealy Ortho Plus Bronze big enough for two people?
For occasional nights, yes. Two adults can share a 120 x 190cm mattress for a weekend stay, which makes this size a sensible guest room choice. For nightly sharing it's a squeeze, and the extra firm surface won't soften the lack of elbow room. Couples sharing every night would be better served by the UK double or UK king.
What room size do I need for a small double mattress?
We suggest allowing at least 2.4m x 2.8m. That leaves enough clearance to walk round the bed and open the door, which is often the deciding factor in a box room or loft conversion. If your room is smaller than that, the UK single, at 30cm narrower and the same length, needs at least 2.1m x 2.8m.
Is the small double easier to turn than the bigger sizes?
Yes, and with this mattress that matters. The Ortho Plus Bronze is double-sided, so it needs turning regularly to spread the wear across both surfaces. A 4ft mattress is lighter and easier to grip mid-flip than a UK king or super king, so one reasonably able adult can usually manage it alone.
How much bigger is the small double than the single?
The UK small double is 30cm wider than the UK single, and the two are the same length at 190cm. That extra width is the whole appeal: a teenager or adult who has outgrown a single gets real room to spread out, while the bed still fits a room that couldn't take a UK double.
Where can I buy the Sealy Ortho Plus Bronze in a small double?
Compare the retailers listed on this page. The prices shown here are live and updated as retailers change them, so checking the table is more reliable than any figure we could print. Stock of 4ft sizes can be patchier than doubles and kings, so if you see it available at a price you're happy with, it's worth acting.