DSO"SQUARE BACK" -Brown Sugar Backspray frame/Amber 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. Smoke lens provides natural color viewing and increased protection on sunny days. Amber lens provides high definition contrast and increased vision depth for overcast days.