It could be bright in the morning and dark by afternoon. Lucky for you, your EG3. 5 goggle switches lenses out quickly, and Electric's EG3. 5 Goggle Replacement Lens comes in a tint for every condition. This spherical lens curves horizontally and vertically to provide optimal peripherals and perhaps the most optically correct lens shape available. The inner lens features a pressure valve that prevents optical distortion at high altitudes, and the lens ventilation promotes 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.