These running socks for women have a firm cuff and comfortable fit. Sturdy cuff keeps pesky pebbles from entering. In addition, Merino wool has excellent moisture absorption and drying properties, making it comfortable to wear. Size: S/8.5 - 9.3 inches (21.5 - 23.5 cm), M/9.3 - 10.2 inches (23.5 - 26.0 cm), Material: 53% Nylon, 40% Merino Wool, 7% Lycra Spandex Cushion: Ultra Light Cushion Applicable Category: Run, Bike.