Hi,Dear value customers! we advising you can choose size according your foot length in our size table.
For example, if your foot length (Heel to Toe) is 26 cm,please choose size 8.5=42 in this model.

Size 6.5=38  fit for foot length is 24cm.
Size 7=39     fit for foot length is 24.5cm.
Size 7.5=40  fit for foot length is 25cm.
Size 8=41     fit for foot length is 25.5cm.
Size 8.5=42  fit for foot length is 26cm.
Size 9.5=43  fit for foot length is 26.5cm.
Size 10=44   fit for foot length is 27cm.
Size 11=45   fit for foot length is 27.5cm
Size 12=46   fit for foot length is 28cm.