Metal free: non-metal design is suitable for power lines, heavy machinery and dielectric working environment. Soft lens fringe is extended to the nose area which contours to different nasal size perfectly and snugly. Breathable temple design with ventilations offers flexibility and pliability that fits different sizes of head form. soft fringe molded onto the lens edge provides protection against flying particles attacking from the top of eyes, and also, itprovides users with extreme comfort. UV400 protection