The Fat Boy photochromic sunglasses feature the latest in transitional lens technology. They are precision designed to automatically adjust to temperature and the amount of ultraviolet (UV) light that reaches the lens. Featuring anti-fog, polycarbonate lenses, the Fat Boy boasts increased comfort and protection with closed-cell foam padding around the eyes. With an aggressive, stylish thermoplastic frame, the Fat Boy offers stability and versatility with an edge.