The upper uses PU leather and breathable mesh,and the sole is made TPR rubber,more wearproof like car tire,reduce the deceleration time to keep safety and increase of service life.You can install the wheels we provide in the grooves on the front of the sole, and we provide a tool to remove the front wheel. When you want to glide, press the button at heels, the wheel pop up automatically.Outer Material: LeatherInner Material: MeshClosure: Hook & LoopHeel Height: 3 centimetresUSB Charging: Just connect the USB cable to a computer or USB Plug and wait 2 hours. Then keep charging until the red lights come out ,that can provide 8 hours of lighting time.LED Lights: The switch button is hidden in the Velcro on the side of the shoe. Just press the switch button once, you can light up the LED lights and change color. Long press the switch to turn off the lights.Roller skates are the perfect gift for children's birthday parties, shows, Christmas, Thanksgiving and Halloween celebrations. For beginners or young children, we recommend using under parental supervision.