Polypropylene Thermal Underwear Turtle Neck from Military Thermal made for the coldest winter days giving warm and comfort for active men and women. Polypropylene Thermal Turle Neck Underwear is finest for its lowest heat transfer, thermal conductivity and exceptional moisture away keeping the body heat and skin dry during outdoor activities on extreme cold days such as camping, hunting, skiing, hiking, running and other activities under the cold weather. Polypropylene Underwear Turtle Neck is soft and durable, color fast, resist fading and continues to look good even in chlorinated climates. Polypropylene Thermal Turtle Neck allows stretches for flexible movement and helps head off clammy chills so check the size chart for different sizes for your proper fittings to stay comfortable, warm and dry.