VILOCY Unisex Children LED Light Up Shoes Roller Skate Shoes Flashing Sneakers Mesh Rubber sole Auto,Flashing,Detachable, Retractable, Athletic 7 colors LED light,Single wheel,Breathe Mesh upper more lightweight Attention the battery could not be changed!!! It is best GIFT, send to you baby, family member, friend.Suit for boys and girls training Please measure your foot length and choose size according to the size chart below Foot length+(0.5 to 1.5cm)=Insole length EUR30=insole 19cm EUR31=US12=insole 19.5cm EUR32=US13=insole 20cm EUR33= US2=insole 21cm EUR34= US2.5=insole 21.5cm EUR35= US3=insole 22cm EUR36= US4=insole 23cm EUR37= US5=insole 23.5cm EUR38= US6=insole 24cm EUR39= US6.5=insole 24.5cm EUR40= US7=insole 25 cm EUR41= US8=insole 25.5cm EUR42= US9=insole 26 cm EUR43= US9.5=insole 26.5cm