Sealy Ortho Plus Silver Memory Mattress
Mattress
Sealy Ortho Plus Silver Memory Mattress
Size
Firmness
Construction
Depth (cm)
25
Layers
2
Layer Details
- MemorySense Foam PowerPack. A comfort layer that adapts to the shape of your body, cocooning you in soft foam. It relieves pressure on the parts of your body that bear the majority of your weight, typically hips and shoulders.
- PostureTech CS Spring System with EdgeGuard. Sealy's adaptive spring system responds to subtle shifts in body weight and pressure, giving localised support rather than a uniform push-back. High-density EdgeGuard foam strips wrapped around the inside of the springs firm up the edges of the bed.
Layer details from mattressnextday.co.uk product page, September 2026.
- Proper stretching room for one: At 30cm wider than the UK single, the small double lets a solo sleeper roll and spread without meeting the edge.
- A double feel in a compact room: It's 15cm narrower than the UK double, which can be the difference between a bedroom that works and one where the door catches the bed.
- Edge support matters more at 4ft: EdgeGuard foam strips firm up the perimeter, so the outer inches of a narrower mattress stay usable rather than feeling like a slope.
- Pressure relief across the full width: The MemorySense foam layer cradles hips and shoulders wherever you settle, useful when you have licence to sleep diagonally.
- Copes with occasional sharing: The PostureTech CS springs give localised support, so when a guest room couple shares for a weekend, one person turning disturbs the other less.
This size suits you if...
You sleep alone most nights and have outgrown a UK single but can't spare the floor space a double demands, your box room, loft conversion or studio measures at least the 2.4m x 2.8m we suggest for this size, or you're furnishing a guest room where couples stay occasionally rather than nightly.
Consider another size if...
You share the bed every night and the room can take something wider. At 120cm across, the small double is a squeeze for two long term, so we'd recommend the UK double instead; allow at least 2.6m x 2.8m for it.
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Will the Sealy Ortho Plus Silver small double fit in a box room?
Usually, yes. At 120 x 190cm it's 15cm narrower than a UK double, and we suggest a minimum room size of 2.4m x 2.8m so you can still open the door and walk around the bed. Measure the room and the access route before ordering, because this mattress is delivered flat rather than rolled.
Is the small double harder to get upstairs than a boxed mattress?
It can be. The Sealy Ortho Plus Silver arrives flat, not compressed in a box, so you're manoeuvring a full 120 x 190cm, 25cm deep mattress through doorways and up stairwells. The small double is easier to handle than the wider sizes, but tight turns and narrow lofts still need measuring first.
Can a couple sleep on the Sealy Ortho Plus Silver in a small double?
For occasional nights, yes. The springs respond locally rather than tilting the whole surface, and the EdgeGuard perimeter keeps the outer edges supportive, both helpful when two people share 120cm of width. For every night as a couple, we'd suggest sizing up to the UK double, which is 15cm wider.
Should a solo sleeper pick this in a small double or a UK double?
If the room allows either, it comes down to space versus cost of floor area. The UK small double already gives a lone sleeper generous room to spread out, and the memory foam layer relieves pressure wherever you end up lying. Go for the UK double only if the room comfortably exceeds the 2.6m x 2.8m we suggest for it.
Is the small double a good size for a teenager's room?
Often, yes. A teenager who has outgrown a single gets 30cm of extra width without losing much floor space, since the UK small double and the UK single are the same length. The medium firm feel suits back and combination sleepers, though a very light side sleeper may find it slightly firm at the shoulder.