Hawk ST 11121 8GB FX Glossy Black Modular Helmet - X-Large Advanced Composite Thermoplastic Shell Aerodynamic shell design for stability at higher speeds Flip-Up Chin Bar and Face Shield: Front easy-to-actuate button easily flips up to turn from full-face to open-face modular positions Dual visor design; clear Polycarbonate face shield Upper and lower chin bar intake vents for maximum airflow is adjusted by glove-friendly dials on each intake vent