Sealy Advantage Quartz Memory Double Mattress
The Sealy Advantage Quartz Memory Mattress combines a MemorySense foam layer with PostureTech CS springs, which means you get that slow, cradling memory foam feel on top with proper spring support underneath rather than an all-foam base.
- Memory foam eases pressure points
- Stable edges, no roll-off feeling
- Twice-tempered springs hold their shape
£519
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 Advantage Quartz Memory Mattress
More available sizes
Mattress details
Mattress
Sealy Advantage Quartz Memory Mattress
Size
Firmness
Medium Firm
Construction
Foam
Memory Foam
Depth (cm)
27
Layers
4
Layer Details
Quilted Cover
The cover is stitched together with the fillings to create a patterned comfort quilt, which means the surface has a soft, cushioned feel built in rather than a flat top. It's the first thing you'll notice when you lie down.
MemorySense Foam
This memory foam layer adapts to your body position, cocooning you and easing pressure at the shoulders and hips. In practice, that means less tossing and turning to get comfortable.
PostureTech CS Springs
These springs respond to your body weight to give deep-down support, so heavier areas get more pushback than lighter ones. They're twice tempered, meaning the steel is heat-treated twice to stay resilient over years of use.
EdgeGuard
A high-density foam strip reinforces the springs around the perimeter, extending their lifespan. You'll feel this as a firmer, more supportive edge, useful if you sit on the bed or share it and need the full width.
Layer details from mattressnextday.co.uk product page, September 2026.
Key benefits
- A footprint most rooms can take: At 135 x 190cm, or 4ft 6in x 6ft 3in, the UK double fits the average UK bedroom without swallowing it.
- Bedside tables on both sides: In most rooms this width leaves enough clearance for a table each side, which matters more than it sounds when you share every night.
- Usable edges when you're sharing: EdgeGuard reinforcement firms up the perimeter, so two people on 67.5cm each for two people sharing can actually use the full width.
- Medium firm support for two: The PostureTech springs respond to each sleeper's weight separately, so a heavier partner gets more pushback without tipping you towards the middle.
- Easy to move in: A UK double is generally the largest size that turns tight terrace stairs and narrow new build landings without a struggle.
- Simple to dress: Double sheets and duvets are stocked everywhere at every price point, handy if you're kitting out a whole home on a stretched budget.
This size suits you if...
You share the bed and your room sits around the typical UK size, where a UK king would leave little walking space. It also suits a first flat or second bedroom where the bed shares the room with a wardrobe and drawers, or a guest room that needs to sleep visiting couples comfortably. Allow at least 2.6m x 2.8m of floor space.
Consider another size if...
Two of you regularly wake each other up, and your room can take something wider. The UK king is 15cm wider and 10cm longer than the UK double; we suggest at least 2.7m x 2.9m for it.
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 Advantage Quartz in a UK double big enough for a couple?
Yes, for most couples. You get 67.5cm each for two people sharing, and the memory foam layer absorbs movement, so a restless partner disturbs you less than on a bouncier bed. It's a snugger fit than a UK king, so if either of you sprawls, or your bedroom can take 2.7m x 2.9m, consider sizing up.
What room size do I need for the Sealy Advantage Quartz UK double?
We suggest allowing at least 2.6m x 2.8m, with around 3m x 3m the comfortable norm. That gives you space to walk round the bed and open drawers. If you want bedside tables on both sides, measure with those included; the UK double usually allows them where a UK king would not.
Will a UK double Sealy Advantage Quartz get up the stairs in an older house?
Usually, yes. At 135cm wide the UK double is generally the largest size that manages the turning stairs in older terraces and the tight landings of some new builds without drama. The sprung core means it won't roll up like an all-foam mattress, so measure any awkward turns before delivery day.
Should I get this mattress in a UK double or a UK king?
Go by your room first. The UK double suits bedrooms around 2.6m x 2.8m and up; the UK king is 15cm wider and 10cm longer, and we suggest at least 2.7m x 2.9m for it. If you share every night and space allows, the extra width is usually worth having. Solo sleepers rarely need it.
Can I use the edges of the double if we're sharing?
Yes, and in this size that matters. On a UK double a couple naturally spreads towards the sides, and the EdgeGuard foam strip around the springs keeps the perimeter firm, so sleeping near the edge doesn't give you that roll-off feeling. It also helps if you sit on the bed to dress in a smaller room.