Propet Maya Leather Synthetic sole Stretchable synthetic material on the vamp conforms to your foot for a comfortable fit. Hook-and-loop instep strap adjusts for a custom fit and allows for easy on / off. Two removable insoles offer added depth options so you can use your own orthotic. Leather / synthetic upper, leather upper lining and sockliner, polyurethane insole and midsole... Fiberglass shank, polyurethane outsole.