Sealy PostureLux Forbes Double Mattress
The Sealy PostureLux Forbes Mattress combines a latex comfort layer with PostureTech pocket springs and UniKey edge support, which means a buoyant, medium-feel surface with a stable edge to sit or sleep on.
- Buoyant latex pressure relief
- Springs adapt to your body shape
- Stable UniKey edge support
£1,599
Get the lowest price we've found
Save with the previous model
Some retailers still sell the earlier version of this mattress for less than the current model's best price.
Sealy PostureLux Forbes Mattress
More available sizes
Mattress details
Mattress
Sealy PostureLux Forbes Mattress
Size
Firmness
Medium
Construction
Foam
Latex
Pocket Spring
Depth (cm)
32
Layers
3
Layer Details
Latex comfort layer
A latex layer that delivers pressure relief and a naturally buoyant feel. You sit on the surface rather than sinking deep into it.
Sealy medium premium foam
A double layer of Sealy's medium premium foam, creating a complete comfort stack. It adds cushioning beneath the latex to keep the medium feel consistent.
PostureTech Core Support Plus springs
Springs with six turns each, twice tempered, with UniKey edge support. They adapt to your body shape and keep the edges steadier when you sit or sleep near them.
Layer details from crushedvelvetbedstore.co.uk product page, November 2026.
Key benefits
- Leaves room for the rest of the bedroom: We suggest a room of at least 2.6m x 2.8m, so most standard UK bedrooms can take a UK double with bedside tables on both sides.
- Edges you can actually sleep on: UniKey edge support keeps the sides steadier, which means the 67.5cm each that a UK double gives couples stays usable right out to the edge.
- A middle-ground feel for two: It's rated medium, which suits most couples with mixed tastes, although a partner who loves a firm bed may find it gives a little less support than they'd like.
- A proper shared bed for guests: In a spare room, a UK double gives visiting couples somewhere comfortable to sleep together while still leaving floor space for a wardrobe or chest of drawers.
- Bedding that's easy to find: Standard double fitted sheets suit the 135 x 190cm surface, and a 200 x 200cm duvet gives two sleepers enough overhang to stop any tugging in the night.
This size suits you if...
You share the bed every night in a standard UK bedroom and still want bedside tables on both sides, or you're kitting out a guest room where visiting couples need a comfortable shared bed rather than a squeeze.
Consider another size if...
You both sprawl, or one of you finds 190cm too short. We'd recommend the UK king instead: it gives 75cm each and is 10cm longer, so allow at least 2.7m x 2.9m.
Similar Mattresses in This Price Range
Did you know? On Mattress Unboxed we have over 1,000 different mattresses to suit all types of sleepers. View all mattresses.
FAQ's
Is the Sealy PostureLux Forbes double big enough for two people?
For most couples, yes. A UK double gives you 67.5cm each, which is comfortable if you both sleep fairly still. If one of you spreads out, the UK king adds 7.5cm each. The UniKey edge support helps at this width, because it keeps the sides steady when you're sleeping close to them.
What size bedroom do I need for a Sealy PostureLux Forbes UK double?
We suggest at least 2.6m x 2.8m, with around 3m x 3m feeling comfortable once bedside tables on both sides and a wardrobe are in. In a smaller second bedroom, measure where the doors and drawers open before you commit, since those clearances are usually what feels tight first.
Sealy PostureLux Forbes double or king: which should a couple choose?
The UK king is 15cm wider and 10cm longer than the UK double, giving 7.5cm more each. It needs more room, though: allow at least 2.7m x 2.9m. If your bedroom is tight, the UK double keeps the room usable. If you have the space and either of you is tall, choose the UK king.
What sheets and duvet fit a Sealy PostureLux Forbes double?
Use UK double bedding made for a 135 x 190cm mattress, which is 4ft 6in x 6ft 3in. The mattress is 32cm deep, so pick fitted sheets designed for deeper mattresses to stop the corners slipping off. A 200 x 200cm duvet gives two people enough width to share without pulling.
Will a Sealy PostureLux Forbes UK double get up narrow stairs?
Measure first. A UK double is 135 x 190cm and 32cm deep, so turning stairs in older terraces and tight new build landings can be awkward. Check the narrowest turn and the bedroom doorway against those figures, then compare the retailers listed on this page.