These are perfect for those with slim calves. Mine are only 12.5" at the widest, and my ankles are barely 8". I found that these were comfortable-great quality-and if you can get them on sale even better. For reference I wear a size 8 shoe and they were for me-true to size. But I also have narrow feet. And the height of the boots were great-just about 2 inches below my knees. (I'm 5'6) I am extremely happy with my purchase. Its not easy finding boots to fit my stick legs.