It is not standard US size.
Please decide the shoes size according to your foot length or your shoes inside length.
-EURO 39=24.5cm =9.64″ =6 B(M) US
-EURO 40=25cm =9.84″ =6.5 B(M) US
-EURO 41=25.5cm =10.04″=7.5 B(M) US
-EURO 42=26cm =10.24″=8.5 B(M) US
-EURO 43=26.5cm =10.43″=9 B(M) US
-EURO 44=27cm =10.63″=9.5 B(M) US
-EURO 45=27.5cm =10.83″=10 B(M) US
-EURO 46=28cm =11.02″=10.5 B(M) US
-EURO 47=28.5cm =11.22″=11 B(M) US
-EURO 48=29cm =11.42″=12 B(M) US
-EURO 49=29.5cm =11.62″=13 B(M) US
-EURO 50=30cm =11.82″=14 B(M) US