Shoe size is based on the insole length.
Insole length = Foot length + Free length(0.5~1 cm)
Suitable free length: +0.5 cm for Spring/Autumn Shoes;
+0.5~1 cm for Summer/Winter Shoes.
If your kids feet are fat, or you want to take extra space for growth, you can add 0.5 cm more.
2. How to measure kid's foot length?
Please stand agaist the wall,measure the distance from the wall to kid's front toe. That measured is Foot length.
3. What's the shoe outsole length?
Outsole length is different with the insole length.Usually it's 1-2 cm longer than insole length. You will see some numbers marked on the shoe outsole. The second line number (below China size number) is useless,and surely is not the insole length which you see in our size chart. Please ignore this number.