Your activities can not always aid in keeping warm during the Fall and Winter seasons. ColdPruf&';s Insulated Base Layer will give you that stretch you need to complete your "honey-do" list all the while keeping you warm and comfortable in the weather elements. CPT fiber technology Single-layer engineering 96% CPT performance polyester and 4% spandex Maximum dryness and antimicrobial odor-control properties Highest rate of moisture management and evaporation Moisture Wicking Fiber Technology 4% Spandex for Comfort Fit