The HD lens is resistant to water and dirt marks and also offers 96 percent visible light transmission. Features a high contour single piece lens with 180° distortion free viewing and excellent optical quality. Patented non-pressure co-molded temples and anti-slip silicone nose pads provide excellent fit and comfort. Upper brow guard offers protection from overhead particulate hazards. Meets both ANSI Z87.1 and CSA Z94.3 standards. This lens is ideal for very humid environments. The high impact scratch. 6.5" D x 5.875" W x 2" H