Fashion Shoes Kids Led Usb Charging Glowing SneakersChoose the correct size according to the foot length or insole length! Before buying these shoes please measure your boy's foot length as below: Tips: 1) Usually, the size you need = insole length = foot length (from heel to toe) + (0. 5 1 cm) 2) Select the correct US size. UU. According to the size chart below 2) If your child's foot is fat and wide, select a larger size. 4) If you don't know how to select, let me know the child's foot length.