Two shell sizes in high-resistant thermoplastic resin with double density in three sizes Features and integrated ventilation system with wide channels hollowed directly into the shell Enhances airflow in the helmet for improved aerodunamic penetration Includes five front air vents, two side extractors and two rear extractors Fully removable and washable inside padding in Dry-Comfort® Double-D retention system Adjustable Peak DOT and ECE 2205 certified