DESCRIPTION How to Choose the Size? The Size isn`t Standard US Size or Euro Size, please choose the size according to Foot Length. Insole Length= Foot Length + (0.5 cm~1cm) Note: This shoe size is EUR size, the other will be different! Of course, you can also purchase according to the length of the insole! Children shoe size chart: EUR size 21-30 Suitable for 0-6 years old EUR size 31-35 Suitable for 6-10 years old All measurement in cm,please note 1 cm=0.39 inch,1 inch=2.54 cm