Conforms to facial contours for a very comfortable fit with adjustable elastic band Meets ANSI Z87+ standards for medium energy impact resistance against flying particles, optical clarity of the polycarbonate lens, and coverage Ventilation holes on top and bottom allow air ...Conforms to facial contours for a very comfortable fit with adjustable elastic band Meets ANSI Z87+ standards for medium energy impact resistance against flying particles, optical clarity of the polycarbonate lens, and coverage Ventilation holes on top and bottom allow air circulation that keeps your face cooler and reduces fogging PVC frame fits over prescription glasses. Measures 5⅞-inches long, 2¾-inches wide, and 2¾-inches tall. Weighs only 2.2 ounces