100% Merino Wool - Knitted in Vietnam, Merino is nature"s most technical, high-performance fibre. Its complex structure makes it remarkably soft against your skin, helps regulate your body temperature, and stays looking great wear after wear. * Thermoregulation Properties - The Merino wool fabric helps to regulate body temperature, due to its natural moisture-management and thermoregulation properties. The regulation of body temperature also helps to lower heart rate and prevent the production of lactic acid which leads to cramps, as blood can flow more freely as the body begins to cool. * Interior Flat-Lock Seams - Provides additional comfort and helps to prevent the risk of chafing. * Stripe Tape Binding at the Back of the Neck - Enhances comfort whilst in motion. * Jersey Knit: UPF 30