Sealy Immerse Hybrid Geltex Mattress
Mattress
Sealy Immerse Hybrid Geltex Mattress
Size
Firmness
Construction
Depth (cm)
29
Layers
3
Layer Details
- Geltex® Memory Foam. A gel-infused foam that cradles your body for pressure relief while staying breathable, which means you get the contouring of memory foam with less of the heat build-up. It sits at the top, so this is the feel you'll notice first.
- Tencel® Fibres. Soft, eco-friendly fibres that give the sleep surface a silky-smooth feel. They're naturally breathable, helping the mattress stay fresh and comfortable through the night.
- 1400 Pocket Springs. Each spring sits in its own fabric pocket and moves independently, which means support adjusts to your shoulders and hips rather than pushing back as one block. This also cuts down on motion transfer between partners.
Layer details from mattressnextday.co.uk product page, September 2026.
- 90cm of space each: Two sharers get 90cm each, which means a partner turning over happens somewhere over there rather than against your shoulder.
- Springs that keep movement local: Each of the 1400 pocket springs moves on its own, so across this much width a fidgeting partner's motion fades before it reaches you.
- Room for night-time visitors: When a child pads in at 3am, or the dog treats the bed as routine, there is enough width for everyone to keep a fair share.
- Cooler across a bigger surface: The Geltex foam and Tencel fibres are built for breathability, and with this much surface area two warm bodies are less likely to share heat.
- Fits a larger master properly: In a big period bedroom or a generous new build master, a UK king can look undersized, while the UK super king fills the space as intended.
This size suits you if...
You share the bed every night and want to stop being aware of each other, your partner genuinely thrashes about and distance is the only fix, children or pets regularly join you before morning, or your bedroom is large enough that a smaller bed would look lost in it. Allow at least 3m x 2.9m of floor space, with around 3.5m x 3.2m feeling comfortable.
Consider another size if...
Your room falls short of the 3m x 2.9m we suggest, or you'd rather not pay super king bedding prices. The UK king of this mattress is 30cm narrower, the same length, and needs at least 2.7m x 2.9m, so we'd recommend that instead.
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Is the Sealy Immerse Hybrid Geltex super king good for restless couples?
It is one of the better cases for this size. You each get 90cm of width, and the 1400 pocket springs move independently, so movement is absorbed close to where it happens. Spread across a 180cm wide mattress, most turning and shuffling simply never reaches the other side of the bed.
Will a super king Sealy Immerse Hybrid fit in my bedroom?
The mattress measures 180 x 200cm, or 6ft x 6ft 6in. We suggest a room of at least 3m x 2.9m so you can still open drawers and walk around both sides, with around 3.5m x 3.2m feeling right. Measure with the door swing in mind, as a bed this wide can foul it.
How much wider is the super king than the king in this mattress?
The UK super king is 30cm wider than the UK King, and the two are the same length at 200cm. That extra 30cm is what turns a comfortable bed for two into one where a restless partner, a wandering child or a large dog can join you without anyone feeling squeezed.
Is this size worth it if children climb in at night?
If that happens regularly, yes. At 180cm wide there is room for a small visitor between you without either adult ending up on the edge, and the independent pocket springs mean a child wriggling in the middle disturbs you less than you might expect. On a narrower size, someone usually loses out.
What bedding does the super king Sealy Immerse Hybrid take?
Standard UK super king sheets, sized for the 180 x 200cm footprint, and we suggest a 260 x 220cm duvet so the overhang covers both sleepers properly. Bedding at this size does cost more than king equivalents, which is a small ongoing expense to factor in alongside the mattress itself.