Lorpen's Light Hiking Shorty Sock features 3 separate layers of fibers that work together for comfort, warmth, and moisture management. 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. The COOLMAX layer works 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. Lastly, a layer of Nylon and Ea. LYCRA adds durability and ensure these socks stay up in your hiking boots without slipping down to your toes. These 3 Layers make the T3 Light Hiking Shorty Sock perfect for all day long hikes in any season. Your feet will stay warm, dry, and comfortable all day long.