Dynamic Ventilation system for increased air flow providing more comfort to the rider while driving Regulated density EPS concussion padding lined with specially treated anti allergic velveteen Outer Shell injected from special high impact grade of engineering thermoplastic Removable and replaceable liners Quick release chinstrap mechanism for ease of operation & safety High quality U.V. resistant Polyurethane paints used for aesthetic enhancement. All STUDDS Models come in one standard size (58-60cms) which generally fits all Multiposition articulating optically true injected polycarbonate visor duly silicon hard coated for scratch resistance properties Certification: ISI Certified Helmet Type - Open Face