The ESS Striketeam goggles were created to improve the safety and performance of wildland firefighters. The ESS design provides superior anti-fog and impact resistance, along with improved comfort and ease of use. Here is a summary of the key features: DURABILITY - Striketeam goggles have excellent heat resistance, so they will resist melting. Straps are made from high-memory elastic to provide years of performance. ANTI-FOG - Striketeam goggles are vented like a sports goggle to provide the best anti-fog features available in a fire goggle. That means firefighters can see more clearly, and work for longer periods of time without having to clear or discard fogged goggles. COMFORT - Anatomical face padding seals out dust and particles. SAFETY - Striketeam goggles have outstanding impact protection. They can stop a shotgun blast from 30 feet, and they pass the military .22 caliber ballistic impact test, MIL-V-43511C. EASE OF USE - Features like the Speed Clip strap adjusters make the goggles easier to don and doff, so they will be used more often. INTEGRAL STRAP SYSTEM - No need for aftermarket strap systems. REPLACEABLE PARTS - Clear and Tinted replacement lenses are available, as well as replacement straps and tear-off lens covers. Why replace an entire set of goggles when only one part is damaged? TEAR-OFF LENS COVERS - Striketeam goggles* come with clear films that protect the lens and can be removed to clear vision when splashes block clear vision. *Except the Striketeam WF