Size chart: 
Size         
US          
EU            
Foot length (in)
36
5.5
35.5
8.86
37
6
36
9.06
38
6.5
37
9.25
39
7.5
38.5
9.45
40
8
39
9.65
41
9
40
9.84
42
9
40
10.04
43
9.5
40.5
10.24
We are Asian size, please check the size table carefully before buying.