The lenses of these glasses offer glare protection sufficient even in extreme conditions, when snow or water reflects sunlight from all directions. Cat 4 is so dim that we can't recommend these glasses for use when driving or riding a motorcycle. - Lens: visible light transmission 7% - Basic lens color: brown for better contrast, black mirror - The inner surface of the lens has an anti-fog treatment - Shaped Grip Tech pads on the temples - Air Flow ventilation - Flexible nose pad - Removable side guards - Regular size: - Lens Height (mm) : 45 - Bridge Distance (mm) : 17 - Temple Length (mm) : 130 - Base : 6 - Lens Size (mm) : 59 Julbo has been making sunglasses for more than 135 years. By buying Julbo, you are investing in a quality product and can rest assured the glasses offer perfect UV protection.