Polypropylene Thermal Underwear Socks from Military Thermal, the great thermal foot gear accessories made for the coldest winter days giving warm and comfort for men, women, kids and children. Polypropylene Military Thermal Underwear is finest for its lowest heat transfer, thermal conductivity and doesn’t absorb moisture, 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 Thermal Socks is soft and color fast with thin ankle length and wickable, and gives extra warm, dryness, comfort and protection on your sole.