Our Polypro long sleeve crew top is a reliable thermal undergarment for your cold weather, outdoor adventures. It is made from polypropylene fibres that are 40% lighter than cotton and provide a high warmth-to-weight ratio, giving you comfort and core insulation from the snow fields to your everyday activities. It also draws moisture away from the skin for ease of evaporation, is quick drying, and has excellent resistance to tearing and abrasions. A close fit delivers best results.