Attention:
If your kids foot length is 15.5 cm, then add 1 cm ~ 1.5 cm, you need to choose the size which inside length is 16.5 cm ~ 17 cm.
Size Chart ( 1 inch = 2.54 cm)
Size 24 = Inside length 15 cm, fit for foot length about 14 cm
Size 25 = Inside length 15.5 cm, fit for foot length about 14.5 cm
Size 26 = Inside length 16 cm, fit for foot length about 15 cm
Size 27 = Inside length 16.5 cm, fit for foot length about 15.5 cm
Size 28 = Inside length 17 cm, fit for foot length about 16 cm
Size 29 = Inside length 17.5 cm, fit for foot length about 16.5 cm
Size 30 = Inside length 18.5 cm, fit for foot length about 17.5 cm
Size 31 = Inside length 19 cm, fit for foot length about 18 cm
Size 32 = Inside length 19.5 cm, fit for foot length about 18.5 cm
Size 33 = Inside length 20 cm, fit for foot length about 19 cm
Size 34 = Inside length 20.5 cm, fit for foot length about 19.5 cm
Size 35 = Inside length 21 cm, fit for foot length about 20 cm
H.