Standing between you and the bright sun is a school of tuna just ready to be caught, and the Costa Del Mar Tuna Alley Polarized Sunglasses let you see each one. Costa 400 polarized glass lenses block harmful UV rays as well as harsh glares so your eyes can be at the ready for any subtle bites. The glass lenses are also 20% thinner and 22% lighter than standard glass polarized lenses, and they resist scratches so you can enjoy these sunnies for many years of boating and fishing. Costa Del Mar made the frame out of co injected nylon for durability, and then added vents at the sides to keep your vision crystal clear even in hot environments. An eight base curve means these shades wrap around your face for protection in front and at the sides. Store the Tuna Alley in its hard case when it gets dark and your cooler is filled with a delicious dinner.