US 6.5=EUR 38=FOOT LENGTH 24-24.5CM
US 7=EUR 39=FOOT LENGTH  24.5-25CM
US 7.5=EUR 40=FOOT LENGTH 25-25.5CM
US 8=EUR 41=FOOT LENGTH  25.5-26CM
US 8.5=EUR 42=FOOT LENGTH 26-26.5CM
US 9=EUR 43=FOOT LENGTH  26.5-27CM
US 9.5=EUR 44=FOOT LENGTH 27-27.5CM
Example size suggestion: For example,
your foot length is 26CM, then please choose 41 size,
if your foot length is 26.3CM, then please choose 42 size