Native Eyewear Hardtop Xp Polarized Lens Kit, Gray Gray lenses - 12% vlt (vlt is a measurement of how much visible light is allowed through the lens): Gray lenses are best for sunny to partly cloudy/cloudy light conditions All native lenses come standard with scratch-resistant and hydrophobic coatings help protect against unpredictable impact and minimizing the effects of perspiration and condensation Our lightweight poly-crystal carbonate lenses have passed the ANSI impact features ensuring the best protection of your eyes and tissues during a crash Native lenses block up to 4x more infrared light than regular Polarized lenses while delivering high contrast and crisp definition Native lenses strategically filter out light that creates vision and color distortion and allow your eyes to see your surroundings in vibrant high definition