Shoe size for your reference

Size 15 = insole length 11.5cm
Size 16 = insole length 12.0cm
Size 17 = insole length 12.5cm
Size 18 = insole length 13.0cm
Size 19 = insole length 13.5cm

Size 21 = insole length 13.8cm
Size 22 = insole length 14.0cm
Size 23 = insole length 14.5cm
Size 24 = insole length 15.0cm
Size 25 = insole length 15.5cm