These All-Star Catalyst NOP Youth Football Helmets feature a shell constructed with High Impact Resistant ABS plastic. The flared corrugations in the shell are for increased shell strength, improved deflection, and a unique stylized design. All holes and ridges on the helmet are rounded off for no sharp edges. Shell is compatible with 4 point low and high hook-up chin straps. The UltraCool venting system relies on an air channel designed liner and 8 large ventilation ports. The EPP liner combined with the Vinyl Nitrile inserts makes an extremely high energy absorbing helmet.