The Fall Line L is part of Oakley\'s ‘Line\' series of cylindrical lens goggles. The rimless frame provides a large field of view for exceptional vision on the mountain. Outriggers and a streamlined frame design help them to be highly compatible with most helmets. Ridgelock Technology makes removing the lens easy and provides a complete seal between frame/lens. Lens: Prizm Black IridiumVLT: 5.5% (CAT 4)Size: LargeLens Shape: Visual Light Transmission, VLT, refers to the amount of light that penetrates a lens. A low percentage means less light passes through and a higher percentage lets an increased amount of light through. A lens with a lower VLT rating is better for bright conditions, where as one with a higher VLT is more suited for overcast and snowy days.Main LensPrizm Black Iridium is suited to bright light and bluebird days; the Iridium coating reduces glare from sunlight reflecting off the snow, whilst the rose tint increases definition. Prizm technology blocks specific wavelengths of light whilst boosting others to provide maximum contrast and enhanced visibility. This greater clarity results in reduced reaction times and increased performance over a wide range of light conditions.