Stance Men's Momentum Crew Running Sock 47% Nylon, 44% Polyester, 5% Cotton, 4% Spandex Imported Machine Wash Moisture-wicking fibers and graduated compression Air channel cushioning with anatomical fit Anatomical venting thermos regulation Reinforced toe and heel for maximum durability Fit no. 448 the compression crew, fine knit, medium cushion, active secure support