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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.