DOT Approved Advanced Polycarbonate Compact Shell : Lightweight, superior fit and comfort using advanced CAD technology Impact Absorbing Multiple Density Expanded Poly-styrene Liner Dual Performance Street & Off Road Easily convert from Street; shield & Visor to Dirt; Visor Only Aerodynamic Adjustable Visor and Shell Large Eye Port for maximum visibility and superior goggle fit ACS Advanced Channeling Ventilation System: Full front to back airflow flushes heat and humidity up and out SuperCool Moisture-wicking Interior