Elvex SG24M mirrored lens with UV Protection. XTS stands for Extraterrestrial and it pretty much explains the style. Unlike several similar styles, our XTS frame is substantial and sturdy. It provides a very close fit with the face and can therefore fill the safety requirements of a safety spectable, including the important side coverage. Lens are 99.9% UV protected and complies with ANSI Z87.1-2010 (+) and CE EN-166 safety standards..