Layering system known as Air Gap Technology™ allows the combinations of lighter weight fabrics to increase the thermal heat resistance (Arc Rating) of the garments. ArcGear™ Hazard Risk Category 4 hoods features multi-layer Nomex® and Kelvar® construction, dielectric hard cap, replaceable tinted lens with anti-fog coating, lens extends 3” from face to accommodate respirators along with minimizing lens fog and meets ANSI Z87.1. Optional battery operated unit available with detachable cooling system for comfort. 40 cal/cm² Rating. Meets or exceeds NFPA 70E, ASTM F 1506 and ASTM F2178 standards. Sold by the each.