ESS Crossbow One Terrain Tan Sunglasses with Interchangeable Smoke Grey Lens meet the rigorous demands of combat situations. Smoke Grey interchangeable lenses offer crystal clear vision with ClearZone FlowCoat anti-fog technology. Whether under the blazing sun or encountering fog, expect minimized scratches and a clear view of your objective. For universal comfort and stability, the glasses employ Tri-Tech Fit ergonomics, while the patented DedBolt Lens Lock ensures secure lens retention under impact. These ballistic sunglasses are U.S. Federal OSHA, ANSI Z87.1 2015, CE EN 166, and U.S. MIL-PRF-32432A compliant.