The Sea of Cortez has been called "the world's aquarium," and few waters can match its variety and abundance of marine life. These rugged sunglasses with linear venting, tough nylon material and large fit, were built strong enough to hold their own as you explore any body of water. All Costa lenses have 100% UV blockage for maximum protection and 100% polarization to kill reflected glare. Our 580 technology goes beyond polarization to produce the clearest lenses on the planet. Choose Glass for superior clarity and scratch resistance. Choose Plastic for a lightweight durable option.