The RPHA X Series from HJC Helmets offers a strong yet lightweight and aerodynamic performance shell. Fifteen vents promote maximum airflow, while a double-layer liner helps keep your rider cool. Other features include a large eye port and a self-cooling, moisture-wicking, antibacterial interior. These DOT- and Snell-approved helmets are race-tested and developed alongside AMA pro supercross and motocross competition. The RPHA X series is offered in three shell sizes and comes with a five-year limited warranty.