Fit & Design: Frame Fit: Regular Frame Size: Medium 580P Polycrbonate lenses are lightweight and impact-resistant Polycarbonate and Trivex are the lightest and most durable lenses Classic pilot shape Technology: Polarized lenses protect against UV rays and filter out unwanted glare C-WALL(R) is a molecular bond which is scratch-resistant Lightweight, marine-grade corrosion-resistant Monel(R) frames