The ESS Crossbow Dampener is the first spectacle frame designed for use with ear cup hearing protection and communications devices. Featuring Z-Bend Geometry, the frame's ultra-thin temple arms help keep noise out by minimizing the effect on the padded seal of ear cups. The slim temples eliminate the hot spots and pressure points that commonly occur when normal eyewear is worn under ear cups. The Dampener frame is compatible with all Crossbow lenses. These 2.4mm Polycarbonate lenses feature distortion-free ESSOPTICS and ClearZone FlowCoat technology to combat fogging on the inside and scratches on the outside. The frame's DedBolt Lens Lock provides quick lens interchange and rock-solid retention under impact. Crossbow Dampener ONE Kits feature one fully-assembled eyeshield with ultra-thin Crossbow Dampener frames for use with ear cups. Specifications and Features Ultra-thin Dampener temple arms with Z-Bend Geometry are optimized for use under ear cup hearing pro communications gear. DedBolt Lens Lock provides quick lens interchange rock-solid retention under impact. Advanced ClearZone FlowCoat lens treatments eliminate fog inside prevent scratches outside. Extra-thick, 2.4mm high-impact Polycarbonate lenses. ESSOPTICS deliver distortion-free optical precision throughout the entire field of view. Lenses are interchangeable provide 100% UVA/UVB protection. Includes: Ultra-thin Crossbow Dampener frame with Clear lens. Micro-fiber pouch. Snap-on elastic retention strap. ESS sticker. Crossbow instruction booklet.