Terramar Kids&rsquo; Thermasilk Ultra-Thin Performance Over-Calf Liner Sock (Pack of 1) 80% Silk/20% Nylon Imported Features carbon thermoregulation technology: fast wicking and drying Ultra lightweight (1.0) natural fabric: excellent warmth without weight Inhibits the growth of bacteria that causes odor Natural breathability Ideal for outdoor riding, hunting ,hiking, skiing, snowboarding, Snowshoeing, cycling and other outdoor activities