Sealy Advantage Sapphire Geltex Pillow Top Single 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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Sealy Advantage Sapphire Geltex Pillow Top Mattress
More available sizes
Mattress details
Mattress
Sealy Advantage Sapphire Geltex Pillow Top Mattress
Size
Firmness
Medium
Construction
Gel
Memory Foam
Pocket Spring
Depth (cm)
28
Layers
3
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.
Key benefits
- Leaves floor space for everything else: At 3ft x 6ft 3in, it leaves room for a desk, wardrobe and toy storage in a child's bedroom, which means the bed doesn't take over.
- Steadier sides on a narrow bed: Edge Guard foam strips sit inside the spring unit, which matters on a UK single, where a restless child or teen spends more of the night near the edge.
- Cushioning for a growing sleeper: The Geltex layer under the pillow top gives hips and shoulders a little extra give, so a side-sleeping teenager should feel less pressure on those points.
- Support that follows one body: The PostureTech CS springs respond to shifts in weight, which means localised support for a solo sleeper who turns over through the night.
- Easy to fit into a compact room: We suggest allowing at least 2.1m x 2.8m of floor space, so it works in a box room, a loft conversion or a study that doubles as a guest room.
This size suits you if...
You sleep alone and want a cushioned top on a medium-rated mattress, you're furnishing a child's or teenager's room where storage and a desk need space too, or your spare room is also your office and the bed has to leave room for working.
Consider another size if...
Two people will share it regularly. We'd recommend the UK double instead, which gives 67.5cm each; we suggest at least 2.6m x 2.8m for the UK double.
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FAQ's
Will the Sealy Advantage Sapphire Geltex Pillow Top UK single fit a bunk bed?
Possibly, but check the frame before ordering. The mattress is 28cm deep, which is deeper than many bunk, cabin and mid sleeper frames are designed for. Look up the frame maker's maximum mattress depth and make sure the guard rail still rises well above the sleeping surface once it's fitted.
What size room do I need for a UK single Sealy Sapphire pillow top?
We suggest at least 2.1m x 2.8m of floor space for a UK single. That leaves room to walk around the bed and open a wardrobe, which is why it suits box rooms and children's bedrooms. If you're putting it under a sloping ceiling, check the headroom where the sleeper will sit up.
Is a UK single long enough for a tall teenager?
The UK single is 190cm long (6ft 3in). The UK small double and UK double are the same length, so going wider won't add any length. If your teenager is already close to that height, the UK king is 10cm longer, though it needs considerably more room.
What sheets fit the Sealy Sapphire Geltex Pillow Top single?
Standard single sheets and a single duvet (135 x 200cm) fit the UK single. The mattress is 28cm deep with a pillow top, so check that any fitted sheet you buy states a pocket depth that covers 28cm. Otherwise the corners can ping off during the night.
Can two people share a UK single Sealy Sapphire mattress?
Not comfortably. The UK single is designed for one sleeper. If you want to share a bed with someone, the UK double gives 67.5cm each, and we suggest at least 2.6m x 2.8m for it. For a guest room, two separate UK singles let visitors sleep apart.