What makes feet smell my grand-daughter's feet smell like a locker room

Hello. : Hello. Bacteria like to live in moist environments. When we sweat, bacteria can flourish. We all have bacteria on our skin. The bacteria create substances that have "foot smells". If the feet are not ventilated, more sweat will build up. Think about what makes a locker room stink- gym shoes. Why do gym shoes stink more than our other shoes? - because we exercise and sweat in them.