The 'Silver Back Squat Mobility' eye-wear, fromgoodr’s signature OG line of shades, aredesigned for medium sized heads. The classic translucent grey frames are constructed with a soft-coating to eliminate slippage, and are also 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 deliverscomplete 100% UV400 protection, adding to the quality, and versatility of these sunglasses.