KleenGuard Nemesis Safety Glasses - Free Neck Cord With Every Pair. The KleenGuard Nemesis Safety Glasses are a top selling style and for a good reason. Nemesis Safety Glasses offer a sleek, sporty style designed for maximum safety and comfort. Using a durable, lightweight frame construction with soft, pliable temples contributes to all-day comfort. The single polycarbonate wrap-around lens provides distortion-free optics, ANSI Z87.1-2015 certified impact protection and 99% protection from harmful UV light. Plus, a Free Neck Cord is included with every pair.