Pull On closure Premium Quality: 50% Merino Wool, 45% Cotton, 5% Spandex. The wool sock is soft in touch and friendly to skin. Running socks with natural material are anti-odor and comfort for daily wear. The ultra-thin design suits for spring and summer wear. Non-slip Workout Socks: Unlike other socks slip during workouts or runs. The lycra elastic features good elasticity for a snug, comfort fit. The wide mouth design avoids tight feeling for all day long. Durable Athletic Socks: Reinforced sports socks on toes and heel parts for enhanced durability in high-wear areas. A must have socks should be added to your wardrobe. Super Breathable Sport Socks: The black bottom part is made of merino wool to absorb water vapor from sole of foot fast. The instep mesh weaving helps absorbing sweat during exercise. Foot dupont nylon design is breathable and cozy to protect feet, odorless and moisture wicking. Ergonomic Fit Design: Ergonomic arch support ensures a secure fit and heat dissipation and moisture wicking. Whether you’re in the Gym or on the Road, it keeps your feet stay fresh and cool.