i measured my foot according to the  teva  website instructions an ordered the proper size. however the thong part is so tight i cant even stand it. the length is perfect but the strap is killing me. so i ordered the next size up and they were way to big and i returned them..  so now i am trying to stretch out the thong strap on these. not happy.  I am not the type to write a review normally but I was very disappointed with this.