These boots are definitely not for extra wide calves.  My calves are 17" circumference and these are very tight on my calves.  I chose to cut them on the sides instead of sending them back because I need them so bad.  (It's muddy in the horse pasture due to all the rain we're getting lately)  I wear a size 8-1/2 shoe and ordered a 9 and they do fit just right on my foot.