Phillips Model RG-38 extra large fitover radiation protective glasses, offer a comfortable, lightweight, and durable design that fits over prescription eyewear. The frame is constructed of our durable TR-90 nylon and offers .50mm Pb lateral protection. This product offers our standard high quality, distortion-free SF-6 Schott glass radiation-reducing lenses with .75mm lead equivalency. The Model RG-38 glasses will fit over almost any style of glasses and head sizes with comfort.