Polycarbonate Lens Pvc Frame. Comfortable. Lightweight. Indirect Vents. Cat Ii Conform To En166: Optical Class:1 Bt - (Medium Impact Energy At Extreme Temperatures) 2C-1.2 - Uv Filterthese Goggles Are Treated With Crystal Coat (Tm), C-380M Is A Polysiloxane Based Thermal Cure Hardcoat That Combines Anti-Fog Performance With Abrasion And Chemical Resistance.