TP198 is a plastic wraparound frame made out of TR-90 Nylon offered in a sleek black color. The non slip grip on the arm of the frame offers added comfort and protection to allow them to stay securely on your face. The rubber nose piece allows for a lightweight feel and added grip to ensure that they sit comfortably on your nose. This frame is great for riding a motorcycle and working in a machine shop because of the dual function and style of the frame.This product offers our standard high quality, distortion-free SF-6 Schott glass, radiation-reducing lenses with .75mm lead equivalency. Model TP198 fits best for Large style heads.