Sleep
How to Choose a Mattress Topper: Memory Foam, Latex, Wool and More
A mattress topper solves a narrower problem than most product pages suggest. It changes the surface feel of a bed, adding softness, pressure relief or a touch more support, and it can extend the comfortable life of a mattress that has a few good years left in it. It cannot fix a mattress with a broken structure, a sagging centre or springs you can feel through every layer above them. Knowing which situation you are actually in decides whether a topper is the right purchase at all.
What a topper can fix, and what it cannot
A topper earns its cost when a mattress is structurally sound but feels wrong on the surface, too firm for your taste, running warm, or simply past the softness it had when new. Adding two to eight centimetres of a different material changes how the top layer feels against your body without touching the support system underneath.
A topper does not earn its cost on a mattress that dips visibly in the middle, creaks, or no longer supports your weight evenly. Laying a soft layer over a broken foundation still leaves the broken foundation doing the actual supporting, and a topper cannot correct that no matter how good the material is. If pressing down anywhere on the mattress reveals springs, lumps or a permanent body-shaped dent, the honest fix is a new mattress rather than a topper.
Materials compared
Memory Foam
Best For · Pressure Relief and Contouring
Memory foam moulds closely to the body's shape, spreading weight evenly and easing pressure at the hips and shoulders, which makes it a strong choice for side sleepers in particular. It tends to sleep warmer than other materials and reacts to body heat, softening more as it warms through the night, and gel-infused versions exist specifically to counter that warmth for hot sleepers.
Latex
Best For · Responsive Support That Stays Cool
Latex offers a springier, more responsive feel than memory foam, pushing back rather than slowly moulding, and it sleeps considerably cooler thanks to its naturally more breathable structure. It tends to cost more than foam or wool alternatives and suits back and stomach sleepers particularly well, who benefit from support that resists sinking too deep.
Wool and Feather
Best For · A Softer, More Traditional Feel
Wool and feather toppers add a plush, breathable layer without the contouring effect of foam, closer to a softer, cosier version of the mattress underneath rather than a change in support. Wool in particular regulates temperature well across seasons, though both materials compress over time and need occasional plumping to keep their loft.
Gel-Infused and Cooling Toppers
Best For · Hot Sleepers Who Want Foam's Support
These combine a foam base, usually memory foam, with gel beads or a cooling cover designed to pull heat away from the body faster than standard foam manages alone. They suit anyone who likes memory foam's contouring but has found standard versions uncomfortably warm through the night.
Choosing thickness
A thin topper, roughly two to three centimetres, refreshes the surface feel of a mattress that is still in decent shape without changing much about its underlying firmness. A mid-range topper, around five to six centimetres, makes a noticeable difference to softness and pressure relief and is the depth most people reach for when the goal is genuinely changing how a mattress feels. Anything beyond about eight centimetres starts behaving more like an extra mattress than a topper, adding significant height and a distinctly different feel, worth considering only if the mattress underneath is otherwise too firm to fix any other way.
Matching firmness to how you sleep
The same sleep-position logic that decides pillow loft in our pillow buying guide applies here too. Side sleepers generally benefit from a softer, more contouring topper, since hips and shoulders need somewhere to sink into rather than pressing against a firm surface all night. Back sleepers do well with a medium topper that supports the spine's natural curve without letting it sag. Stomach sleepers tend to need the firmest option of the three, since a soft topper under the hips can pull the spine out of alignment over a full night.
Care and how long a topper lasts
Most toppers benefit from rotating end to end every few months, which spreads wear evenly and slows the development of body-shaped dents. Removable, washable covers extend a topper's usable life considerably and are worth prioritising over a fixed cover during the buying decision. Expect two to four years of good performance from most foam and latex toppers before the material starts losing its responsiveness, a shorter window than a mattress itself but a genuine improvement worth having in the meantime.
Press firmly on your current mattress in several spots. If it feels even and simply too firm or too soft for your taste, a topper is likely to help. If you find dips, lumps or springs anywhere, that is a mattress problem a topper will not solve, however good the material.
The mistakes worth avoiding
Buying a topper to fix a mattress that is genuinely broken wastes money on a layer sitting over a problem it cannot touch. Choosing a thickness far beyond what the mattress actually needs changes the sleeping surface more than intended and can make sheets difficult to fit properly. Ignoring temperature regulation entirely, particularly with standard memory foam, catches plenty of hot sleepers out only after the return window has closed.
Find your topper in two minutes
Our mattress topper quiz matches material, thickness and firmness to how you actually sleep. Sorting your pillow at the same time? Our pillow guide covers the same sleep-position logic.
Quick questions
Will a mattress topper fix a sagging mattress?
No, not in any lasting way. A topper changes the surface feel of a mattress, not its underlying structure, so a sagging or lumpy mattress will still sag and feel lumpy underneath a topper, just with a softer layer on top temporarily masking it.
How thick should a mattress topper be?
Two to three centimetres for a light refresh, five to six centimetres for a noticeable change in feel, which covers most buyers' needs. Beyond roughly eight centimetres a topper starts functioning more like an additional mattress than a surface adjustment.
Do memory foam toppers really sleep hot?
Standard memory foam does tend to trap heat more than latex or wool, since it works by moulding closely to the body with limited airflow. Gel-infused versions and open-cell foam designs are built specifically to address this, so hot sleepers who prefer foam's contouring are not necessarily stuck choosing between comfort and temperature.