At the right time of year, from the legendary 15-mile long white strip of sand separating the deep blue Bahamian waters from the shallow bank of Gun Cay known as Tuna Alley, you can spy tons of Bluefin tuna, migrating north. And with these bad boys on you won't miss many. The Costa Mens Tuna Alley Sunglasses come equipped with integral hinges, a patented vented system and tough-as-nails nylon material.Features:Comfortable large fitStainless steel integral hingeDurable co-injected nylon frameIncludes hard case100% UV light blockage for max protection100% polarization kills reflected glare and reduces eye strainBuilt by hand and backed for lifeEvery pair of Costas include a lifetime warrantyGlass lenses have the greatest clarity and are scratch resistant