Hi,Dear value customers!Please choose size according to the foot length, please do not use the insole length.
For example,if your foot length (Heel to Toe) is 26.5cm, please choose size 42 in this model.

Size 37    fit for foot length is 24.0cm
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