Sealy Duchess Contract Double Mattress
The Sealy Duchess Contract is a medium firm sprung mattress with a quilted surface, available in UK Single, Double, King and Super King sizes.
- Suits most back & combination sleepers
- Usable space right to the edges
- 5-year guarantee
£709
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Sealy Duchess Contract Mattress
More available sizes
Mattress details
Mattress
Sealy Duchess Contract Mattress
Size
Firmness
Medium Firm
Construction
Foam
Depth (cm)
26
Layers
4
Layer Details
Quilted Surface
A quilted sleep surface sits on top, which means a soft, slightly cushioned first impression when you lie down. It's a traditional finish rather than a plush pillow-top feel.
Sealy Medium Foam
Generous layers of Sealy medium foam add comfort between you and the springs. This is what softens the medium firm support so it doesn't feel hard at the surface.
PostureTech Core Support Springs
The PostureTech Core Support system uses springs that gradually get firmer as pressure increases, which means heavier areas like your hips get deeper support while lighter areas rest more gently. The result is pressure relief without sagging.
EdgeGuard
EdgeGuard reinforces the perimeter for added durability and edge-to-edge support. In practice, that gives you more usable sleeping space right up to the sides.
Layer details from sealy.co.uk product page, September 2026.
Key benefits
- Usable width for two: At 67.5cm each for two people sharing, the EdgeGuard border matters, because it lets both of you sleep close to the sides without that rolling-off feeling.
- Fits most UK bedrooms: We suggest a room of at least 2.6m x 2.8m, which means the UK double works where the UK king would crowd the walkways.
- Manageable to turn: This is a double-sided mattress that needs regular flipping, and the UK double is the largest size most couples can realistically turn together without a struggle.
- Suits standard double frames: At 4ft 6in x 6ft 3in it drops straight onto the standard UK double bedstead or divan, including older inherited frames.
- Easy to dress: Standard double sheets and duvets fit, stocked everywhere at every price point, which keeps ongoing costs down compared with the larger sizes.
This size suits you if...
You share the bed every night and want the traditional couples' size in a room where a bigger mattress would dominate, or you sleep alone and like space to spread out, perhaps with a dog or cat claiming a corner. It also suits a guest room that hosts visiting couples, since the medium firm sprung feel is a safe middle ground for most people.
Consider another size if...
You have a bigger room and either of you feels hemmed in at 67.5cm apiece. We'd recommend the UK king instead: the UK double is 15cm narrower and 10cm shorter, and we suggest at least 2.7m x 2.9m for the UK king.
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FAQ's
How much space does each person get on a UK double Sealy Duchess Contract?
Two people sharing get 67.5cm each. That's a snug but workable width, and the Duchess makes more of it than some mattresses because EdgeGuard reinforces the perimeter, so you can lie right up to the sides without the edge giving way. If either of you is a sprawler, the extra width of the UK king may be the better buy.
Will the Sealy Duchess Contract double fit my bedroom?
The mattress itself is 135 x 190cm. For the room, we suggest at least 2.6m x 2.8m, with around 3m x 3m the comfortable norm. That smaller figure still leaves space to walk round the bed and, in most layouts, fit bedside tables on both sides, which is usually the first thing couples check.
Is the UK double Sealy Duchess Contract hard to turn over?
It's a double-sided sprung mattress, so regular turning is part of ownership rather than optional. In the UK double it's a two-person job done comfortably: big enough to need a partner on the other corner, but far easier to rotate and flip in a typical bedroom than the UK king or UK super king.
Will a double Sealy Duchess get up a narrow staircase?
Sealy doesn't publish delivery access guidance for this mattress, and as a traditional sprung design it shouldn't be bent or folded. Before ordering, measure any turning stairs in older terraces or tight landings in a new build against the 135 x 190cm footprint, and check the delivery terms with the retailer you buy from.
Is the UK double Duchess a good choice for a guest room?
Yes, with one condition. The medium firm feel and responsive springs suit a wide range of visitors, including couples, and the 135 x 190cm footprint leaves room for a wardrobe and drawers in a typical second bedroom. Just remember it needs turning regularly even when the room sits empty, so it wears evenly.