Damp sports shoes encourage fungal growth.
The best method to combat this is disinfection by means of UV light.
Whether you do sport, trek, or even if you're just someone who takes an occasional brief walk; in all of these cases, your feet are the part of your body that work the most. So it's quite natural that your feet start to sweat, and that your socks and shoes become damp, or even wet. Especially in the case of children, this perspiration is even more strongly defined. Their shoes begin to smell bad, and bacteria can begin to form very quickly. In contrast to your socks, which you wash and dry daily, your shoes remain "untreated" from day to day. Shoes just can't be washed as simply as all that.
Take a look at our hygiene hints!