97% Wool, 3% Nylon. They recommend avoiding tumble dry as this may cause shrinkage.
Rototo Socks are made in Nara Prefecture which has been Japan's largest sock producing region since the 43rd year of the Meiji Era (1910), when a man there visited the United States to purchase a machine for sewing socks. Woven using old-fashioned sewing machines, Rototo makes "consumables that we can love for a lifetime."
