These extra-tough 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.Similar to the battlefield-proven CDI™, the CDI MAX™ features the ESS Lateral Exchange System™, allowing you to quickly adapt to your environment by interchanging any of the five available lens colors. Medium-Large Fit.Compliant with U.S. MIL SPEC MIL-PRF-31013 (Clause 18.104.22.168), ANSI Z87.1-2010, CE EN 166, and U.S. Federal OSHA. All CDI MAX™ lenses provide 100% UVA/UVB protection. Medium-Large fit.For flat to very low light. Ahigh-contrast lens that helpsbring out definition.