A bath mat is a wet towel that never gets to dry. The top is touch-dry while the underside stays saturated, feeding on the skin you shed and the warm humid air. What grows is the usual indoor mould trio plus whatever rides in on bare feet.

The damp itself matters: visibly damp rooms track with more cough, wheeze, and asthma flares in people already sensitised ¹. Dust mites die off below about 50% humidity, and a soaked mat keeps a bathroom above that for hours after a shower ².

The sharper case is foot fungus. Live athlete's-foot spores stay viable on bathroom surfaces for months ³, and roughly seven in ten people get athlete's foot at some point ⁴. In a household where one person has it now, the shared mat is the reinfection route.

The number that decides your laundry setting: washing at 60°C with detergent clears dermatophytes, and 40°C does not — heat-drying alone fails too ⁵.

Which mat you own decides the routine. Both fabric and porous stone work; each has one failure point people miss.

Humid climate, hard water, or no exhaust fan: halve every interval above.

A dedicated floor towel is the cleanest option of all: dry the floor, drop the towel in the wash, done. Almost nobody keeps it up. Sealed teak or cork slat mats stay dry themselves, yet trap water underneath unless it can drain, which rebuilds the problem.