I ordered these based upon the Aerosoles site stating the circumference as 13". When I got them, they were HUGE in the calf. I looked further and have since seen 13", 14" and 15" stated as the circumference depending upon the site. If you are looking for boots to fit slim legs, don't bother with these. They're cute and the foot size is true. They don't look particularly cheap either, but they run very large in the calf.