Most shoe odour only develops during use. When worn, every shoe has to absorb large quantities of sweat: during an 8- to 10-hour day alone, the human foot can produce up to 200 ml of sweat. Your footwear must first handle this amount of liquid – some is converted to steam and released through the outer shoe material and some is retained in the individual components of the shoe (in the lining, the outer shoe material, the insole and the footbed).
Sweat itself does not smell, but unpleasant odours arise when it comes in contact with bacteria. Once the shoe becomes sweaty, the warm and humid microclimate inside the shoe creates the perfect conditions for the growth of bacteria and fungi. The bacteria break down sweat, creating fatty acids, among other by-products, as a result. These cause the unpleasant odour we can smell. But how do you get rid of this odour from your shoes?