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 26.5cm,please choose size 42 in this model. Size 38 fit for foot length is 24.5cm Size 39 fit for foot length is 25.0cm Size 40 fit for foot length is 25.5cm Size 41 fit for foot length is 26.0cm Size 42 fit for foot length is 26.5cm Size 43 fit for foot length is 27.0cm Size 44 fit for foot length is 27.5cm Size 45 fit for foot length is 28.0cm