Advanced polycarbonate composite shell structure I Meets or exceeds SNELL M2005 & DOT standards & FIM race ready I Wind tunnel tested aerodynamic shell shape I Multiple density impact absorbing EPS liner I Three shell sizes provide superior sport fit I ACS Advanced Channeling Ventilation System I Adjustable Ram Air chin bar vent I 2 stage compression shield closure system I Improved, tool-less shield removal & installation I Complete with aerodynamic dual lens shield and breath guard I Removable / washable Nylex interior I Streamline, wrap-around neck roll reduces wind noise I Optional shields: amber,smoke and electric dual lens shields available.