Pyramex Ztek ARC safety glasses are ideal for use in welding areas. They're designed for peripheral personnel and visitors who are not exposed to direct IR radiation. Great for use under a welding helmet – allows welder to see his work clearly without suffering “welders flash burn” from surrounding welders. Enhanced VLT (Visible light transmission) allows 58% of visible light to be seen. Doesn’t distort color like green shaded lenses.