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.