Sealy PostureTech Oxwich Double Mattress
The Sealy PostureTech Oxwich Mattress pairs twice-tempered PostureTech springs with a thin polyester fibre layer, which means you get firm, responsive support with only a light cushion on top.
- Extra-firm feel for back sleepers
- Responsive support at pressure points
- Reinforced edges against roll-off
£399
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Sealy PostureTech Oxwich Mattress
More available sizes
Mattress details
Mattress
Sealy PostureTech Oxwich Mattress
Size
Firmness
Extra Firm
Construction
Depth (cm)
24
Layers
2
Layer Details
Polyester fibre layer
Super soft polyester fibres sit over the spring unit under a traditionally tufted damask cover. They add a light cushion to your movement, though the surface still feels firm.
PostureTech Core Support spring unit
Twice-tempered PostureTech springs form the foundation and give maximum support to pressure points, with EdgeGuard tucked inside. You get firm, responsive support and a reinforced edge against roll-off.
Layer details from crushedvelvetbedstore.co.uk product page, November 2026.
Key benefits
- The classic couples' footprint: At 135 x 190cm, the UK double leaves floor space a UK king would take up, which matters in a room that also needs a wardrobe and drawers.
- Firm edges help a shared bed: EdgeGuard reinforcement inside the spring unit helps against roll-off, so whoever sleeps nearest the side can use the full 67.5cm rather than edging inwards.
- A flat surface for two back sleepers: Because it is rated extra firm with only a light fibre layer, both partners lie on top of the mattress rather than rolling towards a shared dip.
- Room for bedside tables: In a room of at least 2.6m x 2.8m, the UK double usually leaves space for a bedside table each side, so neither of you climbs over the other.
- Easy bedding to find: Standard double sheets and a 200 x 200cm double duvet fit, and both are sold almost everywhere, which helps if you are furnishing a whole home at once.
This size suits you if...
You share a bed in a typical UK bedroom and want a bedside table each side, you both sleep on your back or front and like an unyielding surface, or you are kitting out a guest room for visiting couples who stay a few nights at a time.
Consider another size if...
Either of you is tall, broad or a restless sleeper who needs more than 67.5cm. We'd recommend the UK king instead, which gives 75cm each and is 10cm longer; allow at least 2.7m x 2.9m for it.
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FAQ's
Is the Sealy PostureTech Oxwich double big enough for two people?
For most couples, yes. A UK double gives 67.5cm each for two sharing, which works well if you both sleep fairly still. Because the Oxwich is extra firm, you are less likely to drift towards each other, but larger partners may feel cramped. The UK king gives 75cm each.
What size bedroom do I need for a Sealy Oxwich UK double?
We suggest at least 2.6m x 2.8m for a UK double, with around 3m x 3m feeling comfortable. That leaves room to walk round the bed and fit a bedside table on each side. In a smaller second bedroom, measure where the wardrobe doors open before you commit.
What are the dimensions of the Sealy PostureTech Oxwich double in feet?
The UK double measures 135 x 190cm, which is 4ft 6in x 6ft 3in. The Oxwich is 24cm deep in every size, so allow for that height when choosing a bed frame and fitted sheets with deep enough pockets.
Should I choose the Oxwich in a UK double or a UK king?
Pick the UK king if you have the room and want more space: the UK double is 15cm narrower and 10cm shorter. We suggest at least 2.7m x 2.9m for a UK king. If your room is closer to 2.6m x 2.8m, the UK double will feel far less crowded.
Will the Sealy Oxwich UK double work for one person and a pet?
Yes, it suits a solo sleeper well. The UK double is 45cm wider than the UK single, so a dog or cat can claim a corner without pushing you to the edge, and the reinforced EdgeGuard sides help if you end up sleeping near the edge anyway.