Zcoins Boys Girls Adults Retractable Single/Dual Wheel Roller Shoes Warm Skate Sneaker lycra mesh Rubber sole PU leather with good quality, lining use soft gauze, shoe soles with ability of light weight and skid resistance Shoe soles use light weight rubber with scratches design in four corners, increase the performance of wearability and anti-skidding. Middle upper design could keep warm and bring cosy feeling. Crystal pulleys use mute bearing, make gliding quiet and smoothly. Shoes adopt design of invisible button to prevent it pop-up accidently. You can hide pulleys by pressing button at heels, if undo the button, it just cant be seen, then it change into a pair of normal sport shoes. When you want to glide, press the button at heels, the pulleys pop up automatically. .Instructions will be attached in the package.