Wiley-X sunglasses PT-1 are from the Interchangeable Series: PT-1 safety sunglasses are designed for CHANGING LIGHT CONDITIONS. Each ballistic lens CONTROLS GLARE ELIMINATES DISTORTION & is 2.3mm THICK EXCEEDING MILITARY FRAGMENTATION STANDARDS. The NEOPRENE EAR TIPS GRIP BETTER AS BODY TEMPERATURE RISES! Frame: Matte Black Lens: Light Rust