The ESS Crossbow Suppressor One steps in as the pioneer in spectacle frames specifically designed for use with ear cup hearing protection and communication devices. Z-Bend Geometry features ultra-thin temple arms designed to minimize interference with the padded seal of ear cups. ClearZone FlowCoat technology and ESSOPTICS deliver distortion-free vision and combat fogging and scratching. All Crossbow components are compatible and interchangeable with the ESS Crosshair and ESS Suppressor. Meets U.S. MIL SPEC MIL-PRF-32432, ANSI Z87.1-2015, CE EN 166, and U.S. Federal OSHA safety standards.