Virtually indestructible, Costa's Harpoon Tortoise sunglasses with Blue Mirror lens are the best fishing sunglasses for those who find their adventure in the most hardcore moments. The Blue Mirror Glass lenses is about 22% thinner and lightweight compared to other polarized glass, boasting 100% polarized and optional mirrored lenses to protect your eyes against the bright sunlight. Worry less about the extra weight and focus on the catch of the day.