Carhartt Men's Force Grid Midweight Synthetic-Merino Wool Blend Socks are made of a nylon, merino wool, elastane blend. Raised grid patterns on arches help feet stay dry and ribbed channels on legs improve ventilation. Temperature-regulating synthetic-merino wool blend fabric keeps feet cool in summer and warm in winter. . . . . . Temperature-regulating wool blend; fights odor; crew height. Heel, arch and toe cushioning; Achille's lock reduces heel lift. Enhanced heel pocket for secure fit; ribbed channels improve ventilation on leg. Enhanced heel pocket for secure fit; ribbed channels improve ventilation on leg. Abrasion-resistant yarns in heel, arch and toe. 59% Nylon, 38% Merino Wool, 3% Elastane. Machine wash. Imported.