The short answer
The material, and the process that made it. It is a property of the product rather than a fault, and on most mats it fades.
PVC — plasticisers, a strong initial smell, fading over weeks. Natural rubber — a rubber smell, slower to fade, and the one some people never stop noticing. TPE — usually mild and short-lived. Cork over rubber — the cork face masks most of it. NBR — a synthetic rubber smell, variable by maker.
What the listing tells you
The material is published on essentially every mat, and it is the figure that predicts this better than price does.
The other three published figures — thickness, density and dimensions — say nothing about smell but decide everything else, and pages here report all four together.
What shortens it
Unroll it in a ventilated room, away from direct sunlight, for several days. Wipe it down with what the maker specifies, which on many mats is water and a cloth and specifically not a detergent or an alcohol cleaner.
Do not seal it in a bag to “contain” the smell; that is what the packaging did, and it is why the smell arrives concentrated.
The other thing new mats do
Shed. Some PVC and TPE mats leave colour on hands for the first sessions. It is a surface treatment wearing in rather than the mat failing, and it stops.
Where this stops
Pages here report the material, the thickness, the density where published, the dimensions and the mass, with the source named. How long a smell lasts is not published by any maker, and this site does not estimate one — the manufacturer’s cleaning instruction is the document that governs what may be used on it.
Questions readers send in about this
Which material smells most?
PVC and natural rubber are the two most consistently reported. PVC smells of plasticisers and fades over weeks; natural rubber smells of rubber and fades more slowly but usually does fade. TPE and cork are the two least reported.
Does airing it actually work?
Unrolling it in a ventilated room away from direct sun is the measure that gets reported as working, over days rather than hours. Direct sun degrades the surface of most of these materials, which trades one problem for another.
Can it be washed?
Where a maker publishes a cleaning instruction, that is the one to follow, and several specifically rule out detergents and alcohol. Soaking any mat is generally outside what its maker documented, and on a closed-cell mat it leaves water in the core.
Last reviewed 20 September 2026