Weighing in at 1500 grams (adult size), our new GP helmet features a technologically advanced polyacrylite shell. This helmet features 16 ventilation holes to channel cool air around and over the rider's head. Specifications Technologically advanced polyacrylite shell construction EPP (expanded polypropylene) chin bar Three shell sizes to fit a variety of head sizes and rider ages. Anatomical 3D contoured cheek pads with emergency release system for first responders. Plastic visor screws and brass inserts.