Omni Wool 3 Pack Endurance Pro No Show Socks, Charcoal Red/Black/Blue, Medium 37% Fine Merino Wool / 35% Nylon / 26% Ultra Spun Polyester / 2% LYCRA spandex Made in USA 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