46% MERINO WOOL, 34% COTTON, 10% COOLMAX,9% STRETCH NYLON, 1% SPANDEX DESIGNED UNIFORM AND PROFESSIONAL WEAR COOLMAX MOVES MOISTURE AWAY FROM THE FOOT. MERINO WOOL MAKES THIS SOCK SOFT & COMFORTABLE FOR HOURS OF WEAR GREAT FOR FALL AND WINTER AVAILABLE IN: MEDIUM (SOCK SIZE 9-11) & LARGE (SOCK SIZE 10-13)