Sealy Enhance Diamond Pocket Geltex Double Mattress
The Sealy Enhance Diamond Pocket Geltex is a medium feel pocket spring mattress with a gel-infused comfort layer, handmade in Sealy's Cumbria workshops.
- Cooler surface for hot sleepers
- Medium feel suits most positions
- Minimises partner disturbance
£679
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Sealy Enhance Diamond Pocket Geltex Mattress
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Mattress details
Mattress
Sealy Enhance Diamond Pocket Geltex Mattress
Size
Firmness
Medium
Construction
Pocket Spring
Depth (cm)
28
Layers
3
Layer Details
Quilted Cover
The cover and fillings are stitched together into a patterned comfort quilt. This gives the surface a soft, slightly cushioned first impression before you reach the layers beneath.
Geltex Layer
A gel-infused layer that responds to pressure, supporting the areas that need it most and helping to prevent sleep-related aches in the morning. It also works as a breathable surface, letting air circulate freely to encourage natural temperature regulation.
Pocket Spring Core
The core holds 1000 springs, each mounted in its own fabric pocket. They react to subtle shifts in body position more accurately than traditional spring systems, which means support that adjusts to you rather than the whole bed moving at once.
Layer details from mattressnextday.co.uk product page, September 2026.
Key benefits
- A shared bed that fits the room: At 135 x 190cm, the UK double leaves space for wardrobes and drawers in a typical British bedroom, where a UK king can start to dominate.
- 67.5cm each for two sharing: Two people get 67.5cm of width apiece, which is workable for couples who sleep close, if a little snug for restless sleepers.
- Pocket springs help at this width: The 1000 individual pocket springs respond to each sleeper separately, which matters more in a UK double where you're never far from your partner's movements.
- Geltex keeps a shared surface cooler: Two bodies raise the temperature of any bed, and the breathable Geltex layer lets air circulate rather than trapping warmth between you.
- Room for bedside tables both sides: In a room of at least 2.6m x 2.8m, our suggested minimum, most couples can still fit a bedside table on each side.
- Easier to get upstairs: At 4ft 6in x 6ft 3in, the UK double turns the stairs of an older terrace or a tight new build landing more easily than the larger sizes.
This size suits you if...
You share the bed every night and your bedroom is a typical UK size, where a bigger mattress would crowd the walkways. Or you sleep alone and want proper space to spread out, perhaps with a dog or cat claiming a corner. It also suits a guest room that regularly hosts visiting couples, since it sleeps two without swallowing a smaller spare room.
Consider another size if...
You and your partner both move around at night and 67.5cm each feels tight, or your room comfortably exceeds 2.7m x 2.9m. We'd recommend the UK king instead: it's 15cm wider and 10cm longer.
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FAQ's
Is a double Sealy Enhance Diamond big enough for a couple?
For most couples, yes. The UK double gives 67.5cm of width each for two people sharing, and the 1000 pocket springs limit how much you feel your partner move. That said, if either of you is broad-shouldered or a restless sleeper, the UK king adds 15cm of width and 10cm of length.
What room size do I need for the Sealy Enhance Diamond in a UK double?
We suggest a room of at least 2.6m x 2.8m, with around 3m x 3m being the comfortable norm. That allowance covers walking space around the bed and, in most layouts, bedside tables on both sides. This is our own guidance, not Sealy's, so treat it as a sensible starting point.
Should I get the Sealy Enhance Diamond in a double or a king?
It usually comes down to your room. The UK double suits most UK bedrooms; the UK king is 15cm wider and 10cm longer, and we suggest at least 2.7m x 2.9m of floor space for it. If your room clears that comfortably and you share the bed, the extra width is genuinely felt.
Will a UK double mattress get up a narrow staircase?
More easily than the larger sizes. At 4ft 6in x 6ft 3in, the UK double is the width most stairs in older terraces and tighter new builds were expected to handle. Pocket spring mattresses like this one don't roll up the way some foam mattresses do, so measure any awkward turns before delivery day.
Is the double Sealy Enhance Diamond good for a guest room?
It's a practical choice, because it sleeps visiting couples without overwhelming a smaller spare room. The medium feel suits most sleeping positions, which helps when you can't predict who'll be using it, and the Geltex surface stays cooler than traditional memory foam. Just check the room meets our suggested 2.6m x 2.8m minimum.