... 1,in-mold technique 2,L size,dull polish 3,23 air vents,good ventilation ,204g 4,factory direct price Bicycles ... Helmets (23 air vents,built-in bongrace) Name 23 Air Vents In-Mold Bicycles HelmetsModel TK ... sell, off the shelf Specifications and Advantages TUV,CE certification;23 air vents, good ventilateBuilt-in in-mold technique , the cover ...