Secure and stylish, this Segway Ninebot helmet keeps you safe on the go. Its sturdy polycarbonate (PC) outer shell absorbs shock for maximum protection, while the expanded polystyrene (EPS) liner keeps the helmet lightweight and comfortable. It comes with an adjustable spin dial to provide a snug fit. | Segway Ninebot Helmet with Adjustable Spin Dial - Small/Medium - Black