These extra-tough Smoke Gray replacement lenses for the CDI MAX sunglass are some of the thickest of any sunglass in the world. Built from 2.4mm high-impact polycarbonate, you'll be more covered than ever before. Compliant with U.S. MIL SPEC MIL-PRF-31013 (Clause 3.5.1.1), ANSI Z87.1?2015, CE EN 166, and U.S. Federal OSHA.