HJC Force Men's FG-17 Street Motorcycle Helmet - MC-1F / Medium Advanced Fiberglass Composite Shell for superior fit and comfort using advanced CAD technology Aerodynamic shell with large eyeport opening for greater visibility ACS Advanced Channeling Ventilation System provides flow-through ventilation, helping to pull heat out of the helmets interior Chin bar vent provides airflow across the shield interior to help eliminate shield fogging DOT FMVSS 218 Certified