the only criterion is barefoot length.
if foot is wide, choose bigger size.
CHECK SIZES:
Size 4.5 = Barefoot Length 22.1- 22.5cm
=EUR Size 35
Size
5 =
Barefoot Length 22.6-
23cm
=EUR Size 36
Size
5.5 =
Barefoot Length 23.1-
23.5cm
=EUR Size 37
Size
6 =
Barefoot Length 23.6-
24cm
=EUR Size 38
Size
6.5 =
Barefoot Length 24.1-
24.5cm
=EUR Size 39
Size
7 =
Barefoot Length 24.6-
25cm
=EUR Size 40
Size
7.5 =
Barefoot Length 25.1-
25.5cm
=EUR Size 41
Size
8 =
Barefoot Length 25.6-
26cm
=EUR Size 42