I have quite thick ankles and calves, so I was worried that these boots wouldn't fit me. I've never had over-the-knee boots before, all the ones I tried were too tight for me. But these are different, these boots are just perfect for me and I love them. Wearing the boots makes my legs look much slimmer than they really are. However, I usually wear size 38 shoes, but I bought size 39. It's a little big for my feet, but with a little cotton in the toe of the boots or with a thicker sock, it's just perfect. So if you are hesitating because of your thick legs, don't worry, order it now. However, it is advisable to order one size larger than the shoe size you normally wear.