Excellent UV/IR protection Excellent UV/IR protection Available in a variety of shades Polycarbonate These are used when working with quartz glass. They have a lighter shade on top and a darker one on bottom, allowing you ample protection from high-temperature torches when needed and better vision when not. They are available in multiple shades and configurations. Please note the welding lens will not filter out the sodium flare for borosilicate lampworking.