Mountain bike styling with the ease and comfort of OneStep fit technology. The Rascal Helmet by Giro includes some of the same features found in our best adult helmets, with one exceptional difference: the self-adjusting OneStep system. OneStep is the easiest way to fit a child’s helmet quickly and securely, without any hassles or fuss. Other features include integrated rear LED taillights for added visibility, and a special pinch-free buckle. It’s a cool helmet with loads of great features for parents and kids alike.