Fit & Design: Oversized frame style for most or a perfect XL fit 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 Spring hinges for a secure fit Technology: Polarized lenses protect against UV rays and filter out unwanted glare Frames made from Costa Del Mar® castor plant bio-based resin