DESCRIPTION How to Choose the Size? The Size isn`t Standard US Size or Euro Size, please choose the size according to Foot Length. Note:Foot Length +(0.5~1)cm=insole length Label size 15 =Insole length 12cm = foot long 11.5cm Age 6-12Months Label size 16= Insole length 12.5cm = foot long 12cm Label size 17= Insole length 13cm = foot long12.5cm Label size 18 =Insole length 13.5cm = foot long 13cm Label size 19 =Insole length 14cm = foot long 13.5cm Label size 22 Insole length 14cm = foot long 13.5cm Label size 23 Insole length 14.5cm = foot long14cm Label size 24 Insole length 15cm = foot long 14.5cm Label size 25 Insole length 15.5cm = foot long 15cm 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! All measurement in cm,please note 1 cm=0.39 inch,1 inch=2.54 cm