Polycarbonate: Polycarbonate is lightweight, comfortable, impact resistant, and provides UV protection.; Base Curve:8; Shatterproof Selenite™ Polycarbonate Lenses that Meet ANSI Z87.1-2010 High Velocity and High Mass Impact Standards as well as US Federal OSHA 1910.133(b)(1)(1) Standards. 100 percent UVA/UVB Protection with Distortion-Free Clarity. T-Shell™ Lens Coating Resists Scratching in Extreme Environments. Light Transmission: 14%-20%.;