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Upper material: meshSole material: plasticThe shoes use AG3/LR41 Battery,if the barrery run out,it need replace battery then the led light run all life.About size:Our size is converted to USA standard according to Amazon size chart.You can choose according to the following suggestions. If your kids have wide and thick feet, we suggest you choose one size larger for him/her.Note: different measurement methods, allowing 0.5-1cm error, thank you understanding.Please measure the child's feet long, then choose the size.