With the Segway Ninebot V2 XS kids helmet, your kids can ride their segways, bikes, and other vehicles in style and comfort. It's designed to fit 55 to 58cm head circumferences, with an adjustable dial to keep it secure. This lightweight helmet absorbs impacts well and uses breathable, washable fabric liners for optimal comfort. | Segway Ninebot V2 Kids Helmet with Adjustable Spin Dial - XS - Black