NOTE: Please measure your feet length carefully and refer to our Size Chart to choose the correct sizeSize Chart: US size 6.5 = size 37= Feet length: 23.3 CM= 9.17 Inches US size 7.5 = size 38 = Feet length: 24CM= 9.44 Inches US size 8 = size 39 = Feet length: 24.6CM= 9.68 Inches US size 9 = size 40= Feet length: 25.3CM=9.96 Inches US size 10 = size 41= Feet length: 26CM=10.23 Inches US size 10.5 = size 42 = Feet length: 26.6CM=10.47 Inches If your foot is wider or fatter than the standard foot, we suggest that you consider increasing one size.