Helmet Material: PolymerLens Size: 2" X 4-1/4"Designed To Be Used For Arc WeldingRatcheting Style Headband To Keep Helmet Tight On Head During UseHeat treated #10 Shaded Lens For Protection While Welding, Shaded Lens Flips Up And Reveals Clear Glass Protective Lens When Not WeldingUV/IR ProtectionMeets ANSI Z87.1 Safety Standards