Quality optics and contemporary design combine to give you the best in hands-free viewing. Lightweight, interchangeable acrylic lenses give you the precision you need for detail work. Lenses are easily changed to a variety of focal lengths. Molded frame is padded with a removable, washable fabric. Comfortably adjusts to all head sizes; the visor can be flipped up and out of the way when not in use. Visor can be worn over prescription or safety glasses.