Sealy Advantage Topaz Natural Double 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
£449
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Sealy Advantage Topaz Natural Mattress
More available sizes
Mattress details
Mattress
Sealy Advantage Topaz Natural Mattress
Size
Firmness
Medium
Construction
Wool
Natural
Depth (cm)
27
Layers
3
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.
Key benefits
- Fits the typical UK bedroom: At 135 x 190cm it leaves walking space where a UK king would crowd the room, and bedside tables on both sides usually still fit.
- Support that reads two different bodies: The PostureTech CS springs firm up where weight presses down, which means a heavier partner gets held up without dictating the feel on the other side.
- Edge support matters more when sharing: EdgeGuard high-density foam around the sides means the sleeper nearest the edge can use their full 67.5cm without feeling they might roll off.
- A medium feel two people can agree on: Medium is the easiest firmness to compromise on, which helps when a double is being bought for a couple rather than one person.
- Easy to dress on a budget: Standard double sheets and a 200 x 200cm duvet are sold everywhere at every price, a small saving that adds up if you're furnishing a whole home.
This size suits you if...
You share the bed every night and want the traditional couples' size in a room where a UK king would dominate, or you sleep alone and want space to spread out, perhaps with a dog or cat claiming a corner. It also suits a guest room that hosts visiting couples, since the medium feel and cushioned wool surface are easy for different sleepers to get on with.
Consider another size if...
You and your partner keep waking each other, or 67.5cm of width each sounds tight. We'd recommend the UK king instead: it's 15cm wider and 10cm longer, and we suggest a room of at least 2.7m x 2.9m for it.
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FAQ's
Is the Sealy Advantage Topaz Natural double big enough for two adults?
It works for most couples, with 67.5cm of width each for two people sharing. That's cosy rather than roomy, so restless sleepers or anyone used to spreading out may prefer the UK king. The EdgeGuard foam around the sides helps here, letting each of you use the full width without the edge feeling soft.
Will a double Sealy Topaz Natural fit in a small bedroom?
Usually, yes. We suggest a room of at least 2.6m x 2.8m, with around 3m x 3m the comfortable norm. That leaves space to walk round the bed and, in most rooms, room for bedside tables on both sides. If your bedroom is smaller than that, the UK small double is 15cm narrower and needs at least 2.4m x 2.8m.
How much bigger is the double than the small double?
The UK double is 15cm wider than the UK small double, and the two are the same length. That extra width goes a long way for couples, since it's shared between you. For a solo sleeper in a tight room, though, the small double often makes better use of the space.
Is this double mattress hard to get upstairs?
Sealy doesn't publish a weight for this size, but at 135cm wide and 27cm deep a sprung double is a two-person job on turning stairs in older terraces or a tight new build landing. Unlike rolled foam mattresses, a traditional sprung build like this arrives flat, so measure your stairwell and doorways before ordering.
Where can I buy the Sealy Advantage Topaz Natural in a double?
Compare the retailers listed on this page; the prices shown here are updated as retailers change them, so what you see reflects current stock rather than a snapshot. It's worth checking back before you commit, since double is the most widely stocked UK size and pricing on it tends to move around.