The KCP Polypro Rib Thermal Undershirt is a combat tested and battle proven thermal undershirt. Shirts of this design and material are worn extensively by soldiers in virtually all NATO aligned forces. Recognizing how popular military surplus polypro shirts have become, KCP has taken their experience in military manufacturing of polypro shirts to make these shirts for civilian sales. For those who are not familiar, Polypro fabric is one of the best moisture wicking and fast drying materials available for clothing and has the added benefit of being a stretch fit material for added comfort and performance. Features:Performance Thermal UndershirtMoisture Wicking and Fast DryingMade in the USA by KCPMade from 100 Polypropylene Rib