They're not radioactive, they just light up! ; Lights up with every step. ; Sneakers in a manmade upper. ; Spiderman graphics allover. ; Hook-and-loop closure for easy on and off. ; Padded tongue and collar for optimal comfort. ; Breathable mesh linings and padded manmade insole. ; Durable manmade outsole. ; Imported. Measurements: ; Weight: 4 oz ; Product measurements were taken using size 9 Toddler, width M. Please note that measurements may vary by size.