Effective 9/3/13 - Per requests from our customers, we are now manufacturing this sock with a slightly larger calf. This was a requested feature from many reviewers and we are happy to be able to accomodate our customers in any way. * Style 20 * Sized 9-11 fits shoe sizes 5-13 * 85% Acrylic/10% Nylon and 5% Spandex * Great for walks, runs, team sports and more!