Injection Molded Polycarbonate Composite Shell: Lightweight superior fit and comfort using advanced CAD technology Meets or exceeds DOT standards Complete with aerodynamic dual lens shield and breath guard Wind tunnel tested aerodynamic shell shape One-piece channeled dual density expanded poly-styrene liner True youth sizes Precise air control with adjustable forehead chin vent and side vents Minimal noise level design Wrap around neck roll for decreased wind noise Aerodynamic quick release shield design Four position positive lock ratchet Comfortable Nylex® liner with sewn in crown pad