... ,in-mold technique 2,L size,dull polish 3,21 air vents,good ventilation ,240g 4,factory direct price Bicycles PartsName ... 21 Air Vents In-Mold Bicycle HelmetModel TK-12P21Color red,light blue ... , off the shelf Specifications and Advantages TUV,CE certification;21 air vents, good ventilateBuilt-in in-mold technique , the cover is ...