Omni-Wool 3 Pairs Merino Wool Light Hiker Socks 70% fine merino wool, 29% nylon, 1% lycra Medium fits Men 6-9, Women 7-10; Large fits Men 9-12, Women 10+ Ultra-fine merino wool wicks moisture and prevents blisters Ventilation panels improve airflow and moisture management Arch band improves fit, feel and circulation Cushioned footbed retains and regains its impact resistence