Costa Del Mar Ballast 580P Polarized SunglassesCosta Del Mar Ballast 580P Polarized Sunglasses are lightweight fishing sunglasses! Costa Ballasts feature a frameless design that leaves the lenses uncovered for a sleek look. The actual frame is constructed of TR 90 that is extremely rugged and durable. The Ballasts come with Costa's 580P lenses that offer excellent clarity and block out 100% of UV rays and reduce eyestrain. These shades feature an integral hinge that will continue to return your