Just by wearing them, these socks promote circulation with natural up-and-down movement of the feet. Jointly developed with the Hiroshima Prefectural University research institution, made in Japan. 68% cotton, non-constricting, gentle comfort. - Color: Beige - Features: Pump-up function that promotes circulation through toe exercises - Materials: Cotton, nylon, polyurethane, acrylic - Size: 22-23 cm Thank you for viewing. I took them out of the bag for photography, but they are unused. Recommended for those concerned about swollen feet. It is said that the pump-up function promotes circulation.