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 FS™ model features a one-piece, wrap-around strap with Velcro tabs, making it simple to attach to any helmet. The patented ESS Speed-Clip™ strap system makes adjusting the FirePro™ straps quick and easy, even with gloves on. The full-perimeter ventilation and filtration system minimizes lens fogging and filters airborne particles, dust, and debris. The FirePro-1977 FS™ features battlefield-proven OpFoam™, a thin-yet-durable anti-microbial face padding that provides maximum comfort and ease of cleaning. Like all other components of the FirePro FS™, the OpFoam™ is heat and flame resistant. The extra-thick, 2.8mm high-impact lenses provide wide peripheral vision and distortion-free optics. These lenses also feature ESS' advanced ClearZone™ FlowCoat lens treatments, which provide an optimal combination of anti-scratch coatings on the outside of the lens and anti-fog coatings on the inside.