The Lorpen T3 Light Hiker Socks features 3 separate layers of fibres that work together for comfort warmth and moisture management A layer of TENCEL reg provides a layer that is soft to the touch and comfortable against the skin It is a fully biodegradable fibre that is made from trees from sustainable farms The COOLMAX reg 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 reg 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 Sock perfect for all day long hikes in any season Your feet will stay warm dry and comfortable all day long