Sealy PosturePedic Gladesville Combination Double Mattress
The Sealy PosturePedic Gladesville Combination Mattress pairs a plush EternityFibre comfort layer with an extra-firm feel, which means you get a very supportive bed with a slightly softer surface on top.
- Extra-firm feel for firm-bed sleepers
- Plush fibre layer softens the surface
- Allergy UK endorsed cover
£1,399
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Sealy PosturePedic Gladesville Combination Mattress
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Mattress details
Mattress
Sealy PosturePedic Gladesville Combination Mattress
Size
Firmness
Extra Firm
Construction
Eco-Friendly
Foam
Depth (cm)
27
Layers
3
Layer Details
EternityFibre
A plush fibre comfort layer that Sealy says adds cushioning and a softer surface. It gives the top of this extra-firm mattress a little more comfort.
INFUSE Eco ComfortCore
A plant-based foam that forms part of the mattress. Sealy doesn't state where it sits in the build, but it adds a plant-based material to the construction.
AlignSupport coils
Patented coils that form the base of the mattress. They provide the firm, supportive feel this mattress is rated for.
Layer details from dreams.co.uk product page, November 2026.
Key benefits
- Fits a typical bedroom: We suggest a room of at least 2.6m x 2.8m, which means most master bedrooms and many second bedrooms can take it without losing the wardrobe or drawers.
- Space for bedside tables: At 135cm wide, a UK double often leaves room for a small table on each side, so neither of you has to reach over the other for a phone or glass of water.
- Firm support across a shared bed: AlignSupport coils form the base, which means two sleepers of different builds both get the same very firm footing rather than one dipping towards the middle.
- An edge you can use: Sealy fits its UniCased edge support system, which matters on a UK double because each of you sleeps closer to the side than on a UK king.
- Easy to dress: Double sheets and duvets are sold almost everywhere, which helps if you are furnishing a whole home and every room is pulling at the same budget.
This size suits you if...
You share the bed with a partner who likes a very firm mattress, and your bedroom has to hold a wardrobe and drawers as well. A UK double also suits a guest room where visiting couples stay a few nights, or a solo sleeper who wants room to spread out.
Consider another size if...
You both sleep restlessly or are tall, and 67.5cm each feels cramped. We'd recommend the UK king instead, provided your room is at least 2.7m x 2.9m.
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FAQ's
Is the Sealy Gladesville UK double big enough for two people?
For most couples, yes. A UK double gives 67.5cm each when two of you share. That is snug if one of you sprawls, and the extra firm feel means you will not roll together, but you will notice each other. The UK king gives 75cm each, so the UK double offers 7.5cm less per person.
What size bedroom do I need for a Sealy Gladesville UK double?
We suggest at least 2.6m x 2.8m. Around 3m x 3m feels comfortable, with space to walk round both sides and open a wardrobe door. In a smaller second bedroom or a first flat, measure where the drawers will go before you commit.
Should a couple choose the Gladesville double or king?
Choose the UK double if room space is the limit. The UK king is 15cm wider and 10cm longer, which helps restless sleepers, but we suggest at least 2.7m x 2.9m for it. If bedside tables on both sides would no longer fit with a UK king, the UK double is the more practical choice.
What are the Sealy Gladesville double mattress dimensions in feet?
The UK double measures 4ft 6in x 6ft 3in, or 135 x 190cm. It is 27cm deep, so check that your fitted sheets have deep enough pockets, and measure any tight turns on the stairs or landing before you compare the retailers listed on this page.
Is the Gladesville UK double long enough for tall sleepers?
At 190cm, the UK double is the same length as the UK single and 10cm shorter than the UK king. Most adults fit comfortably. If either of you is tall enough for your feet to reach the end, the UK king's extra length will feel noticeably roomier.