Crew length 36% polyester, 29% acrylic, 26% nylon, 6% natural latex rubber, 3% elastane Climacool keeps you cool and dry when you heat up; Mesh ventilation inserts help manage moisture Formotion anatomical design supports optimal movement of the foot Anti-slip yarn on cuff for a stay-put fit; Ribbed insert on heel Designed for specific left and right fit New with tags. Medium Men's 6.5-9 Women's 7-10 Medium size posted in under Women's. Large Men's shoe size 9.5-12 Women's shoe size 10-12 XL Men's 12-16