OUTER MATERIAL: Synthetic Our LED roller skates with upgraded LED light strips and adjustable wheels are ideal for roller skating/party/nightclub/prom/birthday/Christmas. These roller skates are designed with a switch to control the light on/off, the switch is hidden inside the shoe, you can wear them as normal shoes during the day. It will flash when vibrating.Internal material: fabric. Wheel material: PU. wheel type: double wheels. Front wheels are removable and back wheels are retractable. When you need it to be a sneaker. Multi-function. Waterproof LED light, vibration shock.Sole: Thermoplastic rubberBuckle: buckle. Protect your baby's tender feet. These shoes are great - high quality, comfortable to wear and elegant. Your baby can also wear shoes without wheels: super cool and easy to learn to roll.Heel type: western heel. Type: automatic type + invisible button + safety base. When you have them, they are fabulous in the eyes of others. It is very comfortable and surprising, a great gift for baby or best friend. There is a button on the back of the shoe, press the button to control the wheel and hide the wheel.