DSO"57" -Brown to Amber Faded Crystal Clear frame/Amber Gradient Lens - SPECIAL BUY nylon frame polycarbonate lens Frame technology: Frame is made of Grilamid TR-90. Lens technology: Polycarbonate lenses are 40x more impact resistant than glass. 100% protection from harmful UVA and UVB rays. Amber lens provides high definition contrast and increased vision depth for overcast days. Smoke lens provides natural color viewing and increased protection on sunny days.