Sealy Oasis Hybrid Geltex Mattress
Mattress
Sealy Oasis Hybrid Geltex Mattress
Size
Firmness
Construction
Depth (cm)
32
Layers
3
Layer Details
- Cover. A soft-touch cover with a smooth, silky feel. It's gentle against the skin from the moment you lie down.
- Comfort Fillings. Cushioning layers including Geltex, a gel-infused foam, and Tencel fibres, which are soft and eco-friendly. Together they create the mattress's soft, comfortable feel.
- Support System. 1400 individually pocketed springs that work independently of one another. This gives you tailored support and pressure relief where your body needs it.
Layer details from mattressnextday.co.uk product page, September 2026.
- Real space for two: At 5ft x 6ft 6in, the UK king is 15cm wider than the UK double, a difference you notice every time your partner rolls over.
- Less partner disturbance: The 1400 pocket springs move independently, so if one of you gets up hours before the other, the sleeper left behind is less likely to feel it.
- Extra length for taller sleepers: The UK king is 10cm longer than the UK double, which means anyone approaching 6ft can stretch out without their feet reaching the edge.
- Room to shift position: With 75cm each, there's space to prop pillows and change position through the night without crowding your partner, useful during pregnancy or recovery from injury.
- Soft comfort at scale: The Geltex layer cushions shoulders and hips across the full 150cm width, so a side sleeper gets the same plush feel wherever they end up.
This size suits you if...
You share the bed every night and have started to feel the limits of a UK double, one of you is tall enough that a 190cm mattress leaves feet at the edge, or you and your partner keep different hours and want the pocket springs plus the extra width working together to keep movement from travelling.
Consider another size if...
Your bedroom is under our suggested minimum of 2.7m x 2.9m, or you sleep alone and don't need 150cm of width. We'd recommend the UK double instead, which needs a smaller room at 2.6m x 2.8m.
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Is the Sealy Oasis Hybrid Geltex UK king big enough for a couple?
Yes, comfortably. The UK king gives 75cm each for two people sharing, and because this mattress is rated soft with a sink-in feel, that extra width matters: you can settle into your own space without drifting into your partner's. The 1400 pocket springs also work independently, so movement stays on one side.
What room size do I need for a UK king mattress?
We suggest at least 2.7m x 2.9m for a UK king, with around 3.2m x 3.2m feeling comfortable. New build master bedrooms can be tighter than they first appear once wardrobes go in, so measure the usable floor space rather than the room dimensions on the plan before committing to this size.
How much bigger is the UK king than the double?
The UK king is 15cm wider and 10cm longer than the UK double, at 150 x 200cm versus 135 x 190cm. The width is what couples notice first, but the length is the quieter win: if either of you is approaching 6ft, that extra 10cm stops your feet hanging near the edge.
Will the UK king version reduce partner disturbance?
It helps in two ways. The mattress uses 1400 individually pocketed springs, so when one of you gets up early the movement is less likely to carry across. The UK king's 75cm each for two people sharing then adds physical distance, which softens whatever the springs don't absorb. Light sleepers tend to feel the difference from a double.
Where can I buy the Sealy Oasis Hybrid Geltex in a UK king?
Compare the retailers listed on this page; the prices shown here are updated as retailers change them, so it's worth checking back if you're not buying today. Availability in a specific size can shift, so the live table is a more reliable guide than any figure we could print.