Switch out Electric's EGX Goggle Replacement Lens when the conditions change from foggy to bluebird. This cylindrical lens promotes better optics by eliminating peripheral distortion. The inner lens features a pressure valve that prevents optical distortion at high altitudes, and the lens ventilation provides proper airflow. Electric treated this lens with anti-reflection, anti-fog, and anti-scratch hard coatings for a long-lasting performance. Proposition 65 Warning for California Consumers: This product contains chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm.