Merino wool underwear is a 100% renewable natural fibre grown on grass and sunshine. It is designed for maximum comfort for everyday wear or long adventures. Merino has excellent moisture management, tranferring perspiration away from the body keeping you cool and dry during exercise, and warm when less active. Merino is highly breathable ensuring optimum core temperature, thus reducing lactic acid build up. It also has very effective odour control, via natural bacteria in the fibre. Key West merino wool base layers are very comfortable and keep their shape due to the natural elasticity of the fibre.