Even a step beyond the Gravity Zero 9191, which feels light, is the Super G 9172: truly the lightest safety glasses: just 18 grams. The lens, moulded with increased injection pressure, is noticeably thinner yet provides the same protection as other Uvex lenses as well as identical, optimal optical properties. UV400 protection, soft temples (DCT). The clear polycarbonate lens features the Supravision Sapphire coating coating: extremely scratch resistant, chemical resistant and easy to clean.