HIGH QUALITY PROTECTIONKids love to ride, sometimes fearlessly, and they have more trails, bike parks and fun places to shred. Bell-adesigned the Sidetrack youth bike helmet to keep up with them. The Sidetrack features their all-mountain shape with lower coverage on the rear of the head. The ready-for-action style, complete with a cool visor, gets young riders motivated to ride. And the new Ergo Fit system makes it quick and easy to get them going. FEATURESOne Size:-a50 - 57CM / 19.7 - 22.4Ventilation:-a15 ventsErgoDial Fit SystemPinchGuard Buckle