Features:Durable nylon out shell, waterproof and breathable membrane inner layer, and warm spandex lining.External waterproof and soft inside keeps your feet fresh and comfortable all day.Superior wear-resistant and waterproof socks with high elasticity and moderate thickness.Four sizes are available, suitable for both women and men to wear.Perfect for hiking, climbing, jogging, skiing, trekking, and other outdoor activities. Y18022B-M