I took advise from previous reviews. I have a size 9 foot that is narrow. I ordered a 1/2 size smaller (8.5) and a narrow. The boot slipped on and fit LIKE A GLOVE!! They are long and narrow in form so the 1/2 size smaller made them look and fit perfect. An average size foot will want a wider fit so make sure you order the medium or wide fit. I do have smaller calves so they fit beautifully. I believe you would have trouble with 17 calves. I wore em right out of the box and all day long. Better than any other boot or shoe I have ever owned. The boot has a softer leather than I thought. Almost suede like. Very nice and has a little stretch for comfort. I want to wear them all around for dress and getting dirty in the yard. The leather might stain in the dirt. I haven't had them long enough to find out, but I don't care since the comfort is so amazing. I think I will buy another pair for a spare set for later.