Fit & Design: Frame Fit: Narrow Frame Size: Medium Durable, versatile design 580G Lightwave Glass lenses provide superior clarity and are scratch-resistant Encapsulated mirrors between layers of glass are scratch-proof 20% thinner and 22% lighter than average polarized glass Technology: Polarized lenses protect against UV rays and filter out unwanted glare Lightweight, marine-grade corrosion-resistant Monel® frames