Standard - Clear anti-fog replacement lens for Crossblade Series eyeshields includes a Standard Crossblade nosepiece. ESS Modular Technology allows all lenses to be quickly and inexpensively interchanged. Built from extra-thick, 2.4mm high-impact polycarbonate. Crossblade Eyeshield replacement lenses are available in Clear, Smoke Gray, Hi-Def Copper and Hi-Def Yellow. As part of the ESS Cross-Series eyeshield platform, all Crossblade lenses are compatible and interchangeable with the ESS Crossbow, Crosshair and Suppressor frames. Crossblade Standard and Crossblade NARO nosepieces are NOT interchangeable with the other Cross-Series products.