Firmness
Type
Pocket Spring
Depth (cm)
28
Number of Layers
3
Trial Period (nights)
Warranty (years)
5
Price Range
£569 to £989
Best Sleeping Position(s)
Certifications
Assessed from the specification published by MattressNextDay, captured September 2026, and from regular price comparison across our UK retail partners.
This one suits you if you want the responsive, slightly springy feel of pocket springs with a cooler surface than traditional memory foam. The Geltex layer allows air to circulate freely, so if you're a hot sleeper it's a sensible pick. The medium feel works for most sleeping positions, although very heavy sleepers who need firmer support may want something with more resistance. The 1000 pocket springs react to shifts in body position individually, which means less partner disturbance than an open-coil design. The guarantee is five years rather than the longer spans some brands offer, but Sealy's manufacturing pedigree and the BS7177 fire safety certification give some reassurance about build quality.
Key Features & what's inside
- 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.
Who's it NOT for?
If you prefer a very firm surface, the medium feel here may be a little too forgiving. Likewise, if you want the deep, slow-sink hug of a traditional memory foam mattress, the responsive Geltex surface will feel bouncier than you're after. Buyers wanting a decade-plus guarantee should look elsewhere too.
Sealy Enhance Diamond Pocket Geltex Mattress
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Is the Sealy Enhance Diamond Pocket Geltex mattress firm or soft?
It's described as a medium feel. That sits in the middle of the scale and suits most sleepers, although lightweight side sleepers may find it slightly firm and heavier back sleepers may want something firmer.
How many springs does the Sealy Enhance Diamond have?
It has 1000 pocket springs, each individually mounted in its own fabric pocket. This means each spring responds to your body separately, giving more accurate support and less movement transfer than traditional open-coil systems.
Does the Sealy Enhance Diamond mattress sleep cool?
It should sleep cooler than a standard foam mattress. The Geltex layer acts as a breathable surface that allows air to circulate freely and encourages natural temperature regulation, so hot sleepers are reasonably well served here.
What guarantee comes with the Sealy Enhance Diamond mattress?
Sealy ships all its mattresses with a five-year manufacturer guarantee. That's shorter than some brands offer, but it comes from an NBF-approved manufacturer with the mattress handmade in Sealy's Cumbria workshops.
What sizes does the Sealy Enhance Diamond come in?
Five UK sizes: Single, Small Double, Double, King and Super King. Prices range from £569 to £989 depending on the size you choose, and the mattress is 28cm deep across the range.
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