VERY IMPORTANT ! Please size up in these shoes. If you wear a half size , for example 7 1/2, simply size up to the next whole size, such as an 8 . However, if you wear a 7 please size up to an 8 or if you wear an 8 please size up to a 9 etc. TRUST ME ! Corkys Calla are very comfortable hook and loop closure shoes. They are made of synthetic material with a lightly cushioned footbed.