1.6 mm thick, 5.5 base cylindrically cut lens for maximum clarity.Available in regular and short lens options for the optimal coverage and fit.100% UV Protection.Hydroilo exterior surface coating.Full range of interchangeable replacement lenses available for all light conditions.Designed in California.Produced in Italy.CE and ANSI Certified.Filter Category 3Light Transmission 15% 100% Percent Speedcraft SL Replacement Lens HiPER Blue Multilayer Mirror