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Stylish and durable, the Costa Del Mar® Ballast 580P sunglasses are the ideal shades for every day and activity. Frame-less and tipping the scales at an ultra lightweight of 16 grams, you won't even know you're wearing these Costa sunglasses. TR90 nylon ballast material maximizes durability and an 8 Base Curve adds protection in an eye-catching Costa eyewear style.