Lorpen's T3 Women's Padded Trail Running Ultra Light Sock features separate layers of fibers that work together for comfort, support, and moisture management. The COOLMAX fibers work to move perspiration away from the body, and through the fabric, where it can evaporate quickly, allowing the wearer to feel cooler and more comfortable. A layer of TENCEL provides a layer that is soft to the touch and comfortable against the skin. It is a fully biodegradable fiber that is made from trees from sustainable farms Lastly, a layer of Nylon and Ea. LYCRA adds durability and ensure these socks stay up in your running shoes without slipping down to your toes. This combination of fibers make the T3 Padded Trail Running Ultra Light Sock perfect for running in any season. Your feet will stay dry and comfortable all day long.