In fact, I love sweat when my feet are unwashed and used all day! If the shoes are old, the insole is marked with a stamp of the foot. This helps to make rough dirt. I think when you have hardskin and you do not do a pedicure, some of the skin comes off the foot, and if you sweat its mixture with it! It is usually called "TOEJAM". This is what I love! It's a kind of sharp smelly sweaty feet ... ???? Make it skin ... You can check it! Its exactly what I love!!!!