Beautiful waterproof (according to the manufacturer) leather boots. I have a long, narrow foot (11AA) and the 11M fit just fine. My calves are athletic (14.5" around at their widest point) for my height of 5'10." The shaft fit wonderfully -- trim but not tight. The opening at the top is ~14.5." Looking forward to testing out their waterproofing in the next rainstorm :)