Sealy Advantage Quartz Memory Mattress
Mattress
Sealy Advantage Quartz Memory Mattress
Size
Firmness
Construction
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.
- Distance beats any comfort layer: With 90cm each for two people sharing, a fidgety partner is simply too far away to disturb you, whatever the mattress underneath is doing.
- Memory foam that stays put: The MemorySense layer cradles each sleeper individually, so movement on one side of this 180cm width barely registers on the other.
- The whole width is usable: EdgeGuard reinforcement firms up the perimeter, which means you can sleep right at the outer edge on nights the middle fills up with children or pets.
- Springs that spread the load: PostureTech CS springs respond to body weight across the full 6ft x 6ft 6in surface, so two sleepers of different builds each get the right pushback.
- Accessible route to maximum space: This mattress sits at the affordable end for a memory hybrid, making the jump to a super king less painful than it usually is.
This size suits you if...
You share the bed every night and want space to be the solution rather than another compromise, your children or pets treat your bed as theirs and everyone still needs a fair share, or your master bedroom is large enough that a smaller bed would look lost in it. Allow at least 3m x 2.9m of floor space, ideally more.
Consider another size if...
Your bedroom falls short of our suggested 3m x 2.9m minimum, or the extra width would leave no walking room. We'd recommend the UK king instead: it's 30cm narrower, the same length, and needs at least 2.7m x 2.9m.
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Is a super king too big for my bedroom?
It can be. We suggest at least 3m x 2.9m for a UK super king, and that's a working minimum rather than a comfortable one. Measure with wardrobe doors open and bedside tables in place. If the sums are tight, the UK king is 30cm narrower, the same length, and needs at least 2.7m x 2.9m.
Is the Sealy Advantage Quartz super king good for couples with kids climbing in?
It's well suited to that. At 180cm wide there's genuinely room for a visitor without anyone hanging off the side, and the EdgeGuard reinforcement means the outer edges stay supportive when you get pushed towards them. The memory foam layer also absorbs the shuffling, so a small arrival is less likely to wake the far side.
Will one restless sleeper disturb the other on this size?
Less than on any smaller size. You each get 90cm of width, so most turning happens well away from your partner, and the MemorySense foam soaks up movement before the springs pass it along. Across a 6ft width, distance does most of the work and the foam handles the rest.
Can I get a Sealy Advantage Quartz super king up the stairs?
Memory hybrid mattresses like this don't fold, so at 180 x 200cm it's the hardest UK size to move. Check your stairwell width, any landing turns and the bedroom door swing before ordering, and confirm the retailer's delivery access policy. This is the one size where a tape measure on the stairs matters as much as one in the room.
Where can I buy the Sealy Advantage Quartz in a super king?
Compare the retailers listed on this page. The prices shown here are updated as retailers change them, so it's worth checking back before you buy rather than assuming an earlier price still stands. Stock of the UK super king can move separately from the smaller sizes, so availability on the day is the thing to confirm.