If you are buying these and have a high instep, go a size up. I had to return this style as well as the Aerosole's women's coral reef style because my regular size 10 wouldn't fit, and I have bought several shoes from Aerosole's before. I found one of their stores close by me on a recent trip to Miami and I was able to go in and try on other pairs and I got two different styles fitting me in 9 1/2 and 10 respectively so it was definitely the style and not a size increase on my part.<br />The shoes are really well made and beautiful though I was really sad to have to return them.