Sealy Advantage Topaz Natural Mattress
The Sealy Advantage Topaz Natural is a medium-feel sprung mattress with wool fillings.
- Natural wool for a cushioned feel
- Support that holds up over years
- Medium feel suits most sleepers
£379
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The Sealy Advantage Topaz Natural's PostureTech CS springs respond to your body weight, which means firmer support arriving where you press down hardest, while the wool layer above adds a soft, cushioned, slightly traditional feel. At 27cm deep it sits comfortably within standard fitted sheets. Sealy is an NBF-Approved Manufacturer, and the mattress carries a 5-year guarantee. It comes in five UK sizes, from Single through to Super King. If you like a natural-leaning sprung bed without paying premium prices, this is a sensible shortlist candidate.
Mattress specifications
Firmness
Medium
Type
Open Coil Spring
Depth (cm)
27
Number of Layers
3
Trial Period (nights)
Warranty (years)
5
Price Range
£379 to £659
Best Sleeping Position(s)
Side Sleeping
Back Sleeping
Combination Sleeping
Certifications
Assessed from the specification published by MattressNextDay, captured September 2026, and from regular price comparison across our UK retail partners.
Why should you choose this mattress?
The main draw here is the pairing of responsive springs with natural wool. The PostureTech CS springs are twice tempered, which means the steel is treated for resilience, so the support should hold up over years of use rather than softening quickly. Wool above the springs gives that gentle, cushioned surface that people who dislike the sink of memory foam often prefer. EdgeGuard high-density foam runs around the sides, so you can sleep or sit near the edge without feeling you might roll off. The medium firmness suits most sleepers, although anyone wanting a distinctly firm or distinctly plush feel should look elsewhere. It is good value for a sprung, wool-filled build.
Key features & layer details
Quilted Cover
The cover and fillings are stitched together into a patterned comfort quilt. This gives a settled, traditional surface rather than a loose, removable top.
Wool
A wool filling that adds a soft, cushioned feel. It suits sleepers who prefer natural materials and a classic sprung-mattress character.
PostureTech CS Springs
These springs respond to your body weight, targeting support at the areas where pressure is applied, which means your heavier zones get held up rather than sagging. They are twice tempered, so the steel is treated to stay resilient over time.
Layer details from mattressnextday.co.uk product page, September 2026.
Best suited for?
Eco-conscious buyers
The wool filling gives a natural-leaning feel above the springs, which suits people who would rather avoid an all-foam mattress.
Budget buyers
Described as good value for a sprung, wool-filled build, it gives you responsive springs and natural filling without moving into premium territory.
Combination sleepers
Medium firmness and a springy, responsive feel mean changing position through the night should feel easy, without the slow sink of memory foam.
Couples
EdgeGuard high-density foam runs around the sides, so both of you can sleep or sit near the edge without feeling you might roll off.
Heavier sleepers
PostureTech CS springs respond to body weight, sending firmer support to where you press down hardest, so heavier zones are held up rather than sagging.
If you want the contouring hug of memory foam, this wool-and-spring build will feel springier and more traditional than you are after. It is also not ideal if you need a distinctly firm or soft mattress, as this is a medium. And no sleep trial was listed, so cautious buyers may prefer a brand offering one.
Save on an earlier or ex-display model
Some retailers still sell the earlier version of this mattress, or ex-display and returned stock at a lower price. These are the sizes where it costs less than the current model's best price.
Sealy Advantage Topaz Natural Mattress
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FAQ's
Is the Sealy Advantage Topaz Natural firm or soft?
It is a medium. That middle-ground feel suits most sleeping positions, giving back and combination sleepers balanced support, although lightweight side sleepers might prefer something a touch softer and heavier sleepers something firmer.
How deep is the Sealy Advantage Topaz Natural mattress?
It is 27cm deep, which means standard fitted sheets should go on without a struggle while still leaving room for the wool fillings and spring unit.
Does the Sealy Advantage Topaz Natural have a guarantee?
Yes, it comes with a 5-year guarantee from Sealy, as stated on the mattressnextday.co.uk listing. Sealy is also an NBF-Approved Manufacturer, an industry scheme covering how beds are made.
What sizes does the Sealy Advantage Topaz Natural come in?
Five UK sizes: Single, Small Double, Double, King and Super King.
Is there a sleep trial with the Sealy Advantage Topaz Natural?
No trial period was listed on the mattressnextday.co.uk page we reviewed. If trying before committing matters to you, check the returns policy of your chosen retailer before ordering, as terms vary between shops.
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