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the only criterion is barefoot length.

CHECK SIZES: 

US6     =barefoot length 23.6-24cm

            =EUR size 38

US6.5  =barefoot length 24.1-24.5cm

            =EUR size 39

US7     =barefoot length 24.6-25cm

            =EUR size 40

US7.5  =barefoot length 25.1-25.5cm

           =EUR size 41

US8     =barefoot length 25.6-26cm

           =EUR size 42

US8.5  =barefoot length 26.1-26.5cm

           =EUR size 43

US9     =barefoot length 26.6-27cm

           =EUR size 44

US9.5  =barefoot length 27.1-27.5cm

           =EUR size 45