These Right Angle Ribbed Socks provide maximum comfort and support with a knitted heel that is angled at 90° to fit the natural curve of your heel, also helping it stay in place without slipping down. Experience next-level comfort and breathability with this superior design. 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 29-31 13-15 11-13 ⚠ Warning: Reproductive Harm - www.P65Warnings.ca.gov