I normally wear 6 1/2 and purchased a 7 based on other reviews that these ran small.  Should have gone with a 6 since they are too big even with socks, and got a blister from the rubbing after wearing for only a short time.  May go back for a 6.  Contrary to other reviewers, I found these to be extremely generous in the calf width, too generous in fact.  Since I'll wear them mostly for dog walking, decided to  keep since they will do OK for those short walks in wet conditions.