Weighing in at 1325 grams, our new GP Helmet Youth Block features a technologically advanced polyacrylite shell construction. This helmet comes with 16 intake ports to channel cool air around and over a rider's head Weighing in at 1325 grams, our new GP Helmet Youth Block features a technologically advanced polyacrylite shell construction. This helmet comes with 16 intake ports to channel cool air around and over a rider's head, forcing hot sweaty air out through twelve rear exhaust ports. This helmet is designed and intended exclusively for off-road dirt bike riding. Complies with the U.S. CPSC safety standard for motocycle helmet for persons age 5 and older. PART# -104536003 (M)