... ,in-mold technique 2,L size,sand blast 3,28 air vents,good ventilation ,240g 4,factory direct price Bicycle Helment ... Name 26 Air Vents In-Mold Bicycle HelmetModel TK-12P28Color black/red; white ... sell, off the shelf Specifications and AdvantagesTUV,CE certification;28 air vents, good ventilateBuilt-in in-mold technique , the cover is ...