Size 26 Insole length 16cm 4 years old Size 27 Insole length 16.5cm 4 and a half years old Size 28 Insole length 17cm 5 years old Size 29 Insole length 17.5cm 5 and a half years old Size 30 Insole length 18cm 6 years old Size Inner length Suitable age Size 21 13.5cm Around one and a half years old Size 22 14cm Around two years old Size 23 1 4.5cm Around 2 and a half years old Size 24 15cm Around 3 years old Size 25 15.5cm Around 3 and a half years old