Smelly foot and sandals/slippers?

Why do feet smell unpromising sometimes when wearing certain slippers or sandals? but... they don't smell when wearing regular shoes...Smelly foot and sandals/slippers?
If your feet sweat or procure wet on confident shoe materials (leather) it permeates the objects and grows the smelly bacteria. Hard to win rid of except to throw the shoes out!!
sweaty feet from walking use foot spray
Sandals/slippers beside manmade leather often get smelly, so I generally stay away from those, and stick near the genuine stuff. So check those shoes or sandals or anything that you seem to own a problem with, because if adjectives of them are fake leather, or plastic flats, after that may just be your problem.
Some shoes are approaching this. It's be cause of sweat and your shoes procure wet. It depends on the objects of the sandal or slippers. Don't wear man made leather shoes they are the ones that usually stink.