The Costa Del Mar Fantail 580P Polarized Sunglasses won't slip off your face when it counts the most. Even when you have gallons of water in your face and a monster fish on your hook! The Hydrolite co-injected lining on the frame's arms takes care of that, and the overall flexibility of the frame means serious comfort. 580P lenses are the best plastic lenses available, help repel water and oils from your skin, and also block yellow light which enhances the clarity of your vision. The Costa Del Mar Fantail 580P Polarized Sunglasses push the edge in sunglass performance--so you can push it everywhere else.