ESS is a professional manufacturer of safety glasses that produces superior performance products when placed in extreme conditions such as military, special forces, firefighters, rescue forces and more. The lens is made of high impact polycarbonate with a thickness of 2.4 millimeters, and it uses a strong lens that will bounce even 12 gauge shotgun bullets. The lenses are coated with a scratch resistant exterior and an anti-fog coating on the inside. ESS products adopt lenses that have no distortion, are more clear than the naked eye, and less strain on the eyes. Blocks 100% of harmful UV rays and UVA/UVB rays. This is a top quality product that has passed the safety and health regulations (USMIL SPEC PRF-31013) and ANSI (ANSI Z87.1). 1 x Replacement Lenses for Crossbow Sunglasses (Imported) Lens Material: Polycarbonate (0.1 inch (2.4 mm) thick) Accessories: Smoke lens,