Zamp RZ-42Y Youth Snell CMR2016 Helmet Black/Green/Lt Green 57cm. Top Air Intake Vent plus Chin Bar Vents which allows option to Run. Forced Air Accessory Option. Smaller Shell. Composite Kevlar Mix Lightweight Shell. Plush Fire Retardant Interior. Z-21 Series 2.5mm Clear Shield. Rear Spoiler Included for Aerodynamics. Removable/Washable Comfort Cheek Pads and Crown Liner. Snell CMR2016.