As the heel is at a right angle, the socks are knitted at a right angle to wrap comfortably around the heel and prevent the fabric from sagging and slipping off. Pile-knitted to create soft texture using cotton-rich yarn. The top cuff is designed to be less tight so it is more comfortable to wear. Size Chart Japan (cm) US (Women's) US (Men's) 21-23 5-7 3-5 23-25 7-9 5-7.5 25-27 9-11 7.5-10 27-29 11-12.5 9-11