The TK1 series is an affordable alternative for providing comfort, protection, and style. The TK1 features fully adjustable five position ratchet action temples with extendable length. Other features include a wrap-around design and a one-piece polycarbonate lens with integral side shields. The lightweight frame provides added comfort and balance. The polycarbonate lens filters out 99.9 percent of UV radiation that could be harmful to the eyes. Choose the best safety glasses, choose MCR Safety! This product meets the ANSI/ISEA Z87.1 2020 standard.