The XSC Snow Goggle Ionized Lens is a dual vented lenses that can fit the Summit, Impact, and All Sport Series Goggles. The lens is made of an optical Lexan material which is durable and impact resistant and 100% UV protected. The lens comes with an anti-fog treatment and include Iridium lens coating for accurate Light Transmission. Light Transmission: 20%-25%. Good for Sunny Days.