Our shoe stretch dryer helps keep the shape of the shoe as well as dry shoes out to prevent odor build up and prevent bacteria. The water glass technology adsorbs moisture and once unit is full the indicator window beads will turn Pink. Then itís time to recharge unit. Plug in for 8-10 hours until crystals are Blue then itís ready to reuse. Front piece is detatchable to fit smaller shoes. Fitís most shoes.