Stance Men's Jolt Wool Tab Fusion Run Sock, Black, Sock Size:10-13/Shoe Size: 6-12 45% Merino Wool, 45% Polyester, 6% Cotton, 4% Spandex Imported Machine Wash Moisture-wicking fibers Air channel cushioning with anatomical fit Anatomical venting thermos regulation Reinforced toe and heel for maximum durability Fit no. 248 the run tab, fine knit, medium cushion, active secure support