ESS Innerzone is the NFPA Compliant line of ESS structural goggles. ESS Innerzone Goggles are used by the world's most elite firefighting teams. This ESS Goggles series is designed to withstand the rigors of structural firefighting, while offering the highest levels of safety and performance available. ESS Inner Zone is certified by independent test labs to meet or exceed all the standards associated with NFPA 1971-2000, including the 500° F 5-minute oven test. ESS InnerZone Fire Goggles deliver all the standard features you expect from ESS, like extra-thick, optically-correct polycarbonate lenses for distortion-free vision, a comfortable fit with all standard helmets, and an extra-wide field of view.