Browning Hosiery Men's Big Bertha Merino Wool Sock, 2 Pair Pack Wool Nylon Acrylic Foot: 90% Merino Wool, 10% Nylon; Leg: 45% Acrylic, 40% Merino Wool, 13% Nylon, 2% Spandex Extra heavyweight for cold weather; Arch support for added fit; Flat toe seam Full cushion foot; Ribbed knit assures snug fit; Itch-free merino wool Machine wash warm, tumble dry low, no bleach United States