Size Chart:

US8.5: Shoes Inner length: 6.3"

US9.5: Shoes Inner length: 6.5"

US10: Shoes Inner length: 6.8"

US10.5: Shoes Inner length: 7.0"

US12: Shoes Inner length: 7.2"

US12.5: Shoes Inner length: 7.5"

US13.5: Shoes Inner length: 7.7"

US1: Shoes Inner length: 8.0"

US2: Shoes Inner length: 8.2"

US2.5: Shoes Inner length: 8.4"

US3.5: Shoes Inner length: 8.7"