Troy Lee Designs Drone A1 Adult BMX Helmet - Navy/Yellow / Medium/Large 8 pressurized intake passages draw in cool air for maximum ventilation 8 rear vacuum vortex outlets help exhaust and draw heat from head Triple position adjustable retention system allows customized fit for various eyewear, head shape and riding styles Triple position adjustable retention system allows customized fit for various eyewear, head shape and riding styles Full spectrum adjustable moto inspired visor with anodized aluminum hardware