This 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 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. For flat to very low light. Ahigh-contrast lens that helpsbring out definition.