Giro Rascal Child Bike Helmet, Green Mountain Bikers In-mold hardbody with full coverage shell.50-54cm 7 upper vents, 5 rear vents, and an in-molded bug net One-Step Fit Technology with self-adjusting fit and LED flashing lights Fixed webbing position eliminates need for time-consuming Tri-Loc adjustment Universal Child Size: 50-54cm