... in-mold technique 2,L size,dull polish 3,33 air vents,high ventilation 4,factory direct price Bicycle ... Parts(Helmet,33 air vents)Name bicycle parts(helmet,33 air vents)Model TK-12P33Color ... sell, off the shelf Specifications and AdvantagesTUV,CE certification;33 air vents, good ventilateBuilt-in in-mold technique , ... colors for your choosing Bicycle Parts(Helmet,33 air vents)