Read more Ashwood with Copper Lens Blackfin You might have gallons of brine in your face and 600 pounds on your hook, but these sunglasses still won't slip. The Hydrolite co-injected lining takes care of that, and the flexible frame means serious comfort. Blackfin pushes the edge in sunglass performance - so you can push it everywhere else. Costa's co-injected bio-based nylon frame material is both tough and durable, while offering a comfortable fit. TR-90 nylon is a premier material for sports and performance frames as it is resistant to heat and cold. Though it is flexible, it is still durable. Nylon is easily molded into Costa's iconic wraparound shape. Fit: Large RX-Able Bio-Resin Read more The Most Advanced Lens Options 580G - Lightwave Glass Costa's most high tech lens - glass provides the most superior clarity. Costa's encapsulated mirrors (between layers of the glass) are scratch-proof. Costa's glass lens is 20% thinner and 22% lighter than the industry's average polarized glass lens while still blocking 99.9% of glare. 580P – Polycarbonate Polycarbonate is the lightest and most durable lens material option. Providing high clarity, impact resistance and light weight all day wear-ability. The C-WALL molecular bonded mirrors provide the most scratch-resistant and smudge-free barrier, repelling water, oil, and sweat for easier cleaning. Polarization Polarized lenses are essential for anyone who spends time outdoors - especially on the water. But, not all polarized sunglasses are created equal. Costa is 99.9% polarized, providing the best efficiency available so that reflective glare is blocked-reducing eye strain and headaches. Mirrored Costa's mirrors are more than an aesthetic and a necessity in harsh sunlight. Made through a high-tech ion beam deposition process, these multilayered thin film coatings make for the most scratch-resistant mirrors out there. Read more Lens Color Blue Mirror Green Mirror Gray Silver Copper Mirror Copper Silver Sunrise Mirror Description Best for bright, full-sun situations on the open water and offshore. Enhanced vision and contrast for fishing inshore and on flats. A good everyday choice for activities on water and land. Well-suited for stream fishing and other environments with varying light. Cuts glare for eye comfort in a variety of situations, from sight fishing to driving. Extended wear lens. The perfect tool for dusk and dawn performance. 580 Glass ✓ ✓ ✓ ✓ ✓ 580 Poly ✓ ✓ ✓ ✓ ✓ ✓ Light 10% Light Transmission 10% Light Transmission 12% Light Transmission 12% Light Transmission 12% Light Transmission 30% Light Transmission Optimal Usage Boating, fishing in deep water, on open reflective water, in harsh sun Sight fishing in full sun, high contrast All-around activities, natural contrast Excellent for sight fishing, everyday activities, most versatile, cloudy days Sight fishing in variable light and water conditions, everyday activities, driving, high contrast, variable light Activities during sunrise/sunset, heightened contrast, low light/overcast conditions