Omni Wool 3 Pack Endurance Pro No Show Socks, Charcoal Red/Black/Blue, Large 37% Fine Merino Wool / 35% Nylon / 26% Ultra Spun Polyester / 2% LYCRA spandex Made in USA Turn socks inside out before washing. Machine wash warm. Do not bleach. Tumble dry low temperature. Do not iron. Ultra-fine merino wool wicks moisture and prevents blisters Ventilation panels improve airflow and moisture management Arch band improves fit, feel, and circulation Cushioned heel & toe retains and regains its impact resistance