Activated by UV light, our Panovision ProTint shield adapts to changing light conditions. Offering exceptional clarity in low light conditions, our ProTint technology quickly darkens when exposed to bright sunlight. At the race track, up the canyon, or on your way into work, our Panovision ProTint shield offers improved visibility mile after mile. Fits the Race Star Flex, Race Star Flex DLX, Star MIPS, Star MIPS DLX, SRT and SRT Modular.