The T3 light hiker is designed to keep your feet dry on warm hikes. This sock combines 3 layers of technical fibers: coolmax , merino wool, and nil it energy. 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 tinsel 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, nil it energy is a special type of nylon that converts heat emitted by the body and reflects it back to enhance muscle elasticity and oxygen absorption. It is durable and long-lasting. Repeated washing will not decrease the effectiveness of the technology.