The "Back out 9" eye-wear, from goodr’s signature OG line of shades, are designed for medium sized heads. The classic matte black frames are constructed with a soft-coating to eliminate slippage, and are lightweight, making them comfortable enough to wear all day long, whether you are running down balls on court, or just tossing a few to your dog. In addition, mirrored polarized lenses reduce glare, prevent squinting on sunny days, and delivers complete 100% UV400 light protection, adding to the quality, and versatility of these sunglasses.