The Milwaukee® Performance Safety Glasses are designed with high impact, fog-free lenses. This protective eyewear passes a high velocity impact test, for lenses with military grade impact protection. The protective glasses have fog-free lenses, so they stay clear in the toughest conditions and are coated to reduce scratching. The gray lenses are best for working in indoor and outdoor applications. Milwaukee® 48-73-2121 Performance Safety Glasses, Fog-Free, Yellow Lens, Black, Plastic Frame, Polycarbonate Lens, ANSI Z87.1+/CSA Z94.3/OSHA Standard