Firmness
Type
Memory Foam
Depth (cm)
25
Number of Layers
2
Trial Period (nights)
Warranty (years)
5
Price Range
£359 to £629
Best Sleeping Position(s)
Certifications
Assessed from the specification published by MattressNextDay, captured September 2026, and from regular price comparison across our UK retail partners.
This mattress makes sense if you want orthopaedic-leaning support without giving up the cushioned, cradled feel of memory foam. The MemorySense foam layer relieves pressure where your body bears the most weight, while the PostureTech CS springs respond to shifts in position, which means support stays localised rather than the whole surface sinking. EdgeGuard foam strips around the inside of the spring unit firm up the perimeter, useful if you sleep near the edge or sit on the bed to get dressed. Yes, the five-year guarantee is shorter than some brands offer, but the price range of £359 to £629 across five UK sizes reflects that, and the fire safety certification to BS7177: 2008 is reassuring.
Key Features & what's inside
- 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.
Who's it NOT for?
If you sleep hot, be cautious: memory foam holds warmth more than some materials. Lightweight side sleepers may find Medium Firm slightly too firm for full pressure relief at the shoulder. And because it arrives flat rather than boxed, it's a tricky choice for homes with narrow staircases or tight turns.
Sealy Ortho Plus Silver Memory Mattress
Across the 57 verified reviews on mattressnextday.co.uk, where it scores 4.8 out of 5, owners praise the orthopaedic support and comfort of the MemorySense foam and PostureTech springs. Pressure relief comes up often, particularly from buyers who needed extra support.
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Is the Sealy Ortho Plus Silver Memory Mattress firm?
It's described as Medium Firm. That means a supportive feel with some surface softness from the memory foam layer, which suits most back sleepers and heavier side sleepers, although very light sleepers may find it a little firm.
How much does the Sealy Ortho Plus Silver cost?
Prices run from £359 to £629 depending on size, starting at £359.00. It's available in UK Single, Small Double, Double, King and Super King.
Does the Sealy Ortho Plus Silver come with a guarantee?
Yes, it carries a five-year Sealy manufacturer guarantee, as stated on the mattressnextday.co.uk listing. That's shorter than some brands offer, but it comes at a lower price point.
Is the Sealy Ortho Plus Silver delivered rolled in a box?
No. It's delivered flat, not rolled and boxed, so check access through doorways and stairwells before ordering. Mattressnextday.co.uk offers free next day delivery on this listing; delivery terms may differ elsewhere.
How deep is the Sealy Ortho Plus Silver mattress?
It's 25cm deep, which fits standard fitted sheets comfortably. The depth comes from the memory foam comfort layer sitting over the PostureTech CS spring unit.
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