Invisible charging switch, invisible switch inside the Velcro The invisible design makes the shoes beautiful and atmospheric, without affecting the appearance, one click to switch a color, USB data charging cable, easy charging Cool dual-wheel pulley design The sole is made of TPR material, with the pulley design, it is more cool, it can be disassembled, easy to operate, and easily switch between various wearing modes These unusual shoes, in addition to their stylish appearance, have rollers on the sole so you can not only walk, but also ride with the shoes on Each shoe comes with two rollers/wheels. The rear roller is activated by a button located on the heel of the shoe and can be retracted or pulled out at any time. Optionally, you can place a second roller in front, or remove it, using a special lifting device for this, and the position after removing the roller can be secured using the plugs included in the kit. With the roller hidden/removed, the shoe can be used like a classic sneaker The LED backlight turns on automatically with each step (pedaling), or you can turn it on/off at any time with a button hidden next to the tongue. Insole Length: Size 28 = 18CM Size 29 = 18.5CM Size 30 = 19CM Size 31 = 19.5CM Size 32 = 20CM Size 33 = 21CM Size 34 = 22CM Size 35 = 22.5CM Size 36 = 23CM Size 37 = 24CM Size 38 = 24.5CM Size 39 = 25CM Size 40 = 25.5CM