1.The measurement units of the above data are millimeters; 2. Step on the white paper, use the pen to point out the longest point before and after, the distance between the two points is the correct foot length; 3. There is a slight difference in the size of the left and right feet, which should be based on the data of the larger foot; 4. If the instep is high and the foot type is wide, it is recommended to increase the size-to buy; 5. The measured size should be about the same as the size you usually wear.
Deviations indicate that the measurement method is incorrect or the data is not accurate enough.