The FAB.IT William socks uses a rare low-gauge knitting machine that produces a soft texture like hand-knitted fabric, and the calf rib area is less tight, making for a gentle and soft fit. The heel is knitted larger than usual to improve the hold. The material used is a two-ply yarn that is strong and durable. All FAB.IT products are made in Japan. Mainly in Nara, which is known as the production area. One size fits most: sizes 8-13 80% cotton 20% poly Made in Japan