Children's tractor-style boot

3 years -3.5 years (insole 16cm) 3.5 years - 4 years (insole 16.5cm) 4 years – 4.5 years (insole 17.5cm) 5 years (insole 18cm) 5 years -5.5 years (insole 18.5cm) 6 years (insole 19cm) 6 years – 6.5 years (insole 19.5 cm) 7 years (insole 20cm) 8 years (insole 21cm) 8 years – 8.5 years (insole 21.5 cm) 9 years (insole 22cm)