These are slightly thick, hand-knitted socks. The yarn used is Ichigo Ichie yarn from Knitting Bird. It's made by combining leftover industrial yarns, which took extra effort to knit, but the resulting fabric is very fluffy, light, and soft, stretching to fit the foot perfectly. It's also not itchy. After washing and finishing, the fibers stand up even more, making them warm and plump. Size: Approximately 23-24cm Length from heel: Approximately 15cm The design has a gusset, so there's no feeling of tightness. Materials: A blend of wool, cotton, acrylic, etc. Please hand wash for care. Thank you for looking.