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