Size Chart:(Product Measurement)
US9.5:Shoes Inner length:6.2IN
US10:Shoes Inner length:6.4IN
US10.5:Shoes Inner length:6.6IN
US12:Shoes Inner length:6.8IN
US12.5:Shoes Inner length:7.1IN
US13.5:Shoes Inner length:7.3IN
US1:Shoes Inner length:7.6IN
US4.5:Shoes Inner length:7.8IN
US5:Shoes Inner length:8.0IN
US5.5:Shoes Inner length:8.3IN
US6:Shoes Inner length:8.5IN
This data was obtained from manually measuring the product, it may be off by 0.39-0.79 IN