You might have gallons of brine in your face and 600 pounds on your hook, but these Blackfin Sunglasses from COSTA 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 580 Plastic Lenses with C-Wall Coating580 ClarityLightweight and durableImpact and scratch resistant100% polarization kills reflected glare and reduces eye strain.100% UV light blockage for maximum protection.DetailsComfortable large fit.Integral hinge.Heavy-duty TR 90 nylon frame.Includes hard case.Built by hand and backed for life. Every pair of Costa Sunglasses includes a limited lifetime warranty.SizingBase curve of 8.DBL: 17.6mmTemple Length: 114.8mmLens size A/B: 61.5mm/ 40.5mm