TooTa Sport Mesh Slip Women & Men Outdoor Holes Water Shoes fabric Size instruction: Please follow our size chart details in below description Material: imported sandwich mesh fabric,the bottom is soft TPR (shock proof) This product uses a non-radioactive light green luminous material storage. Under natural light or light exposure 10-20 minutes,It can have a very good luminous effect ,if under strong light,or a long time,luminous intensity and lenght will be enhanced. You can put the soles of the shoes to the light emitting object illuminated headlights,lights and other heat about 10 minutes,and then to a dark place.