The Fall Line XM is the latest model in Oakley’s ‘Line’ series of cylindrical lens goggles in a medium-sized fit. The rimless frame provides a wide field of view for exceptional vision on the mountain. Outriggers and a streamlined frame make them highly compatible with most helmets. Ridgelock Technology makes removing the lens easy and provides a complete seal between frame/lens.Lens: Prizm Sapphire IridiumVLT: 13% (CAT 3)Size: MediumLens Shape: CylindricalLensPrizm Sapphire Iridium is suited for variable to sunny conditions; the Iridium coating reduces glare from sunlight reflecting off the snow, whilst the rose tint increases definition in flatter light. 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.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.