Upper material: artificial leather Pattern: cartoon Sole material: EVA Style: leisure Applicable age group: children lighting through a built-in one time lithium battery , This shoes is non rechargeable and would malfunction as follows with the increase of usage: 1,the two shoes can not light 2,one can light the other fail to light 3,one is lighter than the other Please note that above 3 issues wont be treated as the quality issue even you come to us ,so before you place the order ,please give a second thought Kids Girls Boys Toddler Luminous Trainers Shoes Led Light Up Flash Sneakers