80% Bamboo, 18% Nylon, 2% Spandex Machine wash warm. Tumble Dry Low. Naturally Anti Microbial & Anti Bacterial. Controlled foot odor. Extra Smooth toe seaming. Meaning smooth stitching on the ridge line for extra comfort, Medium weight Crew Socks that reaches to mid calf. Fits Shoe Size 4-10, Socks Size 9-11 COMES in 1 Pair Pack and 3 Pair Pack combination.