This Smoke Gray replacement lens for the Crossbow® eyeshield is built from extra-thick, 2.4mm high-impact polycarbonate, and features ESSOPTICS™ for distortion-free clarity and 100% UVA/UVB protection. ESS ClearZone™ FlowCoat technology is engineered to eliminate fog inside the lens and prevent scratches outside. The Crossbow's DedBolt™ Lens Lock system allows for rapid lens interchange. Crossbow® replacement lenses are available in Clear, Smoke Gray, in Hi-Def Yellow, Hi-Def Copper, Hi-Def Bronze, Polarized Gray and Laser Protective (LPL). Crossbow® replacement lenses are compatible with both Crossbow Tri-Tech Fit™ frames (for normal use) and Crossbow Suppressor™ frames (for use with ear cup hearing protection and communications gear). All Crossbow® replacement lenses include a black Low-Pro Nosepiece and a protective flannel sleeve. As part of the ESS Cross-Series ™ eyeshield platform, all Crossbow® components are compatible and fully interchangeable with the ESS Crosshair™ and ESS Suppressor ™. For example, you can upgrade a Crosshair™ to premium Crossbow® anti-fog lenses--including ANSI-rated Polarized--or adapt for hearing protection use with the ultra-thin Suppressor™ frame. Important APEL Note for U.S. Military Customers: Only Clear and Smoke Gray lenses are approved for use in the U.S. Military.