1,Universal size 2,Reusable and Environmental. 3,Gel shoe insert can massaging and relieving stress on your heels. PU Gel, a natural, washable and reusable substance.for any foot type.reduce pressure and pain on your heel. Adhesive back holds heel cushions securely in place. Hypoallergenic pad won't irritate sensitive skin. No Material PU gel Color based on request Thick Size Weight