Please choose the size according to your feet length. Thanks.<br>Feet length 9.0"= US 5.5= CN 36<br>Feet length 9.25"= US 6= CN 37<br>Feet length 9.45"= US 7= CN 38<br>Feet length 9.65"= US 7.5= CN 39<br>Feet length 9.84"= US 8.5= CN 40<br>Feet length 10.0"= US 9.5= CN 41