The RX-16001 is a plastic wrap around frame made out of TR-90 Nylon with incorporated side face protection. The unique shape of the lenses and the comfortable adjustable nose pads offer a sleek and lightweight feel to these stylish Black/Blue safety frames. This frame is ideal for people with a higher prescription. For Double Segment Height Bifocal glasses only! If you wish to purchase standard prescription safety glasses in this model, please click here. ANSI Z87 Safety Approved.