Sealy Ortho Plus Gold Small Double 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
£469
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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
- Real room for one: At 120cm across, the UK small double is 30cm wider than the UK single, which means a solo sleeper can stretch out or change position freely.
- Fits compact bedrooms: It's 15cm narrower than the UK double, and in a box room or loft conversion that difference can decide whether you can still walk around the bed.
- Firm support at this width: The PostureTech CS springs give the same firm, weight-responsive support across the full 120cm surface, so the extra width doesn't come with a softer edge.
- Usable right to the side: EdgeGuard foam firms the perimeter, which matters more at 4ft wide because a solo sleeper on a small double tends to use the whole surface.
- Manageable to flip: This is a turnable mattress, and the UK small double is one of the easier sizes to flip regularly, so its double-sided design gets used rather than ignored.
This size suits you if...
You sleep alone and have outgrown a single but can't spare the floor space a full double takes, or you're furnishing a guest room or holiday let where couples stay occasionally rather than every night. It also suits a teenager ready for more width in a room that still needs desk and wardrobe space, provided they get on with a firm feel.
Consider another size if...
You share the bed every night, because 120cm is snug for two firm-mattress sleepers who can't sink towards the middle. 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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FAQ's
Is the Sealy Ortho Plus Gold small double big enough for a couple?
For occasional nights, yes. Across a 120cm width two adults can share comfortably enough for a guest room stay, and the firm sprung surface stops you rolling into each other. For every night, most couples want more space: the UK double is 15cm wider and the UK king is 30cm wider and 10cm longer.
What room size do I need for a small double mattress?
We suggest allowing at least 2.4m x 2.8m. That gives you space to walk down one side, open a wardrobe and, since the Ortho Plus Gold is double-sided, enough clearance to actually turn the mattress. In a very tight box room, check the door swing against the 120cm width before you buy.
Is a small double worth it over a single for one person?
If the room allows it, usually yes. The UK small double is 30cm wider than the UK single and the same length, which turns a firm mattress like this from functional into genuinely comfortable for an adult who moves about at night. If your room is under 2.4m wide, the UK single is the safer fit.
Is the Sealy Ortho Plus Gold easy to turn in a small double?
Easier than in the bigger sizes. This is a 29cm deep, hand-tufted, double-sided mattress, and at 4ft x 6ft 3in one reasonably strong person can flip it, although two makes it simpler. That matters because regular turning is how a double-sided design evens out wear.
Where can I buy the Sealy Ortho Plus Gold in a small double?
Compare the retailers listed on this page; the prices shown here are updated as retailers change them. Stock in the UK small double can be patchier than in the UK double or UK king, so if you see it available at a price you're happy with, it's sensible to move fairly promptly.