All goggle components are heat & flame resistant Full-perimeter ventilation & filtration system minimizes lens fogging & filters airborne particles Anti-microbial OpFoam face padding increases comfort & fit Patented Speedclip system allows for rapid strap adjustment & optimal helmet compatibility rapid strap tension adjustment Low-profile frame with wide wrap minimizes helmet interference & maximizes peripheral vision Advanced ClearZone FlowCoat lens treatments eliminate fog inside & prevent scratches outside ESSOPTICS deliver distortion-free optical precision throughout the entire field of view 2.8mm high-impact 100% UVA/UVB polycarbonate lenses Low-profile frame, one-piece wrap-around strap w/Velcro helmet tabs. The ESS FirePro-1977 Series includes the most advanced low-profile willdand fire and rescue goggles on the market. The compact frame design prevents helmet interference while increasing peripheral vision. The FirePro-1977 is certified to meet the NFPA 1977 wildland fire equipment performance requirements, including the 350F for 5-minute oven test. They are also U.S. Federal OSHA compliant, exceed the requirements of ANSI Z87.1-2010, and are considered Primary Eye Protection by NFPA 1500.