SIZES:
18 = C11 (Heel To Toe: 6 7/8 inch)
18.5 = C12. (Heel To Toe: 7 1/8 inch)
19 = C13. (Heel To Toe: 7 1/2 inch)
19.5 = J1. (Heel To Toe: 7 7/8 inch)
20 = J2. (Heel To Toe: 8 1/8 inch)
21 = J3. (Heel To Toe: 8 1/2 inch)