Rototo Flex Stretch Socks - WhiteSize: Small Medium(22 25 cm), Medium Large (26 29cm) MATERIAL 76% COTTON, 15% POLYAMIDE, 9% POLYURETHANE Made in Japan. About Rototo: RoToTo's socks are produced at a factory on Koryo Town, Nara Prefecture, which boasts the largest production of socks in Japan. They work with craftsmen and discuss "manufacturing" at the site (factory). They use a rare special knitting machine, which is limited in number in the world, an old fashioned knitting machine