ACTIVATED BY UV LIGHT: Enhance your ride with Bell ProTint Shields. Activated by UV light, ProTint shields adapt to changing light conditions, providing enhanced vision during any ride. ADAPTIVE TECHNOLOGY: Offering exceptional clarity in low light conditions, ProTint shields quickly darken when exposed to bright sunlight. This adaptive technology helps your eyes adjust to the conditions, even when they are changing as quickly as the road ahead. UNRIVALED DETAIL: ProTint Photochromic lenses provide enhanced contrast, helping your eyes to discern shapes and colors more quickly. The result is enhanced clarity and a reduction in eye strain through varying light conditions. Fits the Race Star Flex, Race Star Flex DLX, Star MIPS, Star MIPS DLX, SRT and SRT Modular.