Note: Shoes insole length = Your kids foot length (heel to toe) + 1 cm. US Size 7 = EUR Size 23 = Shoes Insole Length 14.3 (CM). US Size 8 = EUR Size 24 = Shoes Insole Length 14.8 (CM). US Size 8.5 = EUR Size 25 = Shoes Insole Length 15.3 (CM).