Recommended for those who have trouble with swelling feet, these super loose socks are compatible with the inner circumference of 7.1 - 17.7 inches (18 - 45 cm); Size: 8.7 - 10.6 inches (22 - 27 cm); Material: Acrylic, nylon, polyester, wool, polyurethane; Manufacturer: Kobe thread, Made in Japan.