Costa Del Mar Sunglasses, style Blackfin is an oversize Rx-able rectangular nylon sport wrap with polarized glass lenses. The Blackfin is designed with corrosion-resistant stainless steel hinges, adjustable wire core temples and special materials on the saddle nose bridge and temples to ensure comfort and minimize slippage. The Costa Del Mar logo is engraved on the temples. These Costa Del Mar Sunglasses have lightweight polarized glass lenses that provide amazing clarity and 100% UV protection.