●Real Gold coating rejects 99% of UV&IR from welding arc, reflecting radiant heat for cooler operation and less eye strain. ●Hand Gesture function allows welders to switch the lens between Weld and Grind mode. You are free to turn this function on or off. NOTE: currently not recommend the function for outdoor use. ●Ultralight and ultra thin only 0.19" thickness, fits in all 2" X 4-1/4" welding helmets. ●Stainless steel frame reflects infrared light that causes heat build-up, keeping the lens cartridge cooler. ●2 Amp TIG Rating, great For TIG MIG MMA, Plasma Applications with Grinding Feature.