Not knowing if how the size fits for these awesome sandals I ordered an 8.5 and a 9.  Depending on the manufacturing my foot is typically a size 9, however, I've found that many times an 8.5 will work sometimes better.  I have friends who swear by these sandals and I wanted to give them a try.  I was amazed!  The 8.5 not only fit the best, but I still have a bit of room.  I love these sandals and wear them everywhere.  Choose these babies and your feet will thank you :)