Since the Alien style safety glasses has become the most popular style, we felt that adding an economical, but equally protective version would be a smart move. TTS offers sleek styling, likely to impress today's fashion oriented workers. The close fit and excellent protective features will please employers. The fact that TTS is one of our most economical glasses should make this one of our most successful styles. All lens versions filter our 99% of UV light. Elvex TTS meets the high velocity requirements of ANSI Z87.1-2010 (+) and CE-EN-166.