The Fly Racing Dirt Elite Vigilant Helmet utilizes Fly Racing’s True Functional Ventilation system to keep you cool when the sun is high. The Elite Helmet’s interior is also designed to channel airflow from front to back so you can get the most out of each and every vent. The dual density EPS liner is comprised of two layers of EPS (Expanded Polystyrene), one softer and one slightly harder, which combine to provide more progressive impact absorption for different levels of impact.