Sealy Advantage Sapphire Geltex Pillow Top Mattress
The Sealy Advantage Sapphire Geltex Pillow Top Mattress combines a plush pillow top with a gel-infused Geltex comfort layer, which means a cushioned surface that eases pressure where you feel it most.
- Eases pressure where you feel it
- Support that responds as you move
- Reinforced edges for steady sides
£499
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The Sealy Advantage Sapphire Geltex Pillow Top is a 28cm deep pocket spring mattress rated medium, with a pillow top that makes the surface feel softer. It suits sleepers who want cushioning over responsive support. It comes in a UK single, UK small double, UK double, UK king and UK super king, with a 5-year guarantee from Sealy.
Mattress specifications
Firmness
Medium
Type
Pocket Spring
Depth (cm)
28
Number of Layers
3
Trial Period (nights)
Warranty (years)
Price Range
£499 to £869
Best Sleeping Position(s)
Back Sleeping
Combination Sleeping
Side Sleeping
Certifications
BS 7177
Assessed from the specification published by mattressnextday.co.uk, captured October 2026, and from regular price comparison across our UK retail partners.
Why should you choose this mattress?
The pillow top and Geltex comfort layer give you a cushioned feel, and Sealy says the gel-infused layer relieves pressure on the parts of the body that feel it most. Underneath, the PostureTech CS springs respond to shifts in body weight to give localised support. Edge Guard foam strips sit inside the spring unit, and the reinforced edges should make the sides more dependable. It's handmade in the UK and covered by a 5-year guarantee. Suits most sleepers who want a plush top over a medium rating, although anyone after a very soft feel may want something softer.
Key features & layer details
Pillowtop
A plush pillow top that adds an extra layer of cushioning, which means a softer-feeling surface than the medium rating alone suggests.
Geltex comfort layer
A cushioned, gel-infused Geltex layer that relieves pressure on the parts of the body that feel it most, so your hips and shoulders get some extra give.
PostureTech CS spring system
Pocket springs that respond to shifts in body weight to give localised support, with Edge Guard foam strips inside the spring unit. You get support that follows your movements, plus steadier edges.
Layer details from mattressnextday.co.uk product page, October 2026.
Best suited for?
Side sleepers
The Geltex comfort layer and pillow top add extra give under the hips and shoulders, which means those areas can sink in comfortably.
Combination sleepers
PostureTech CS pocket springs respond to shifts in body weight, so support follows you as you move around during the night.
Couples
Pocket springs give localised support and Edge Guard foam strips steady the sides, so both sleepers get responsive support and a more dependable edge.
Guest rooms
A medium rating with a plush pillow top suits most people, and the five sizes from single to super king fit most spare rooms.
If you prefer sleeping on a firm mattress, this might not be the best choice. It's rated medium, and the pillow top will make the surface feel softer than that. You also can't flip it, so you're limited to rotating it. Sealy doesn't publish a spring count, which makes comparing the support with similar mattresses harder.
Save on an earlier or ex-display model
Some retailers still sell the earlier version of this mattress, or ex-display and returned stock at a lower price. These are the sizes where it costs less than the current model's best price.
Sealy Advantage Sapphire Geltex Pillow Top Mattress
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FAQ's
How firm is the Sealy Advantage Sapphire Geltex Pillow Top?
It's rated medium. The pillow top adds a plush layer, so the surface can feel softer than the rating suggests. That suits sleepers who like cushioning, although anyone wanting firm support may find it too forgiving.
What sizes does the Sealy Advantage Sapphire Geltex Pillow Top come in?
It comes in a UK single, UK small double, UK double, UK king and UK super king. Check your bed frame measurements before ordering, as there's no UK small single option.
How deep is the Sealy Advantage Sapphire Geltex Pillow Top?
It's 28cm deep. If your bed frame has low sides or you already own fitted sheets, check they'll suit a mattress of that height before you buy.
Does the Sealy Advantage Sapphire Geltex Pillow Top have a guarantee?
Yes, Sealy gives it a 5-year guarantee. It's worth checking the exact terms with the retailer before you buy.
Can you flip the Sealy Advantage Sapphire Geltex Pillow Top?
No, it isn't designed to be flipped, which is typical of a pillow top. You can rotate it instead, which helps spread wear more evenly over time.
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