Named for The Sea of Cortez, these Costa shades are perfect for your next watery voyage. Large-fit frame made from heavy-duty TR-90 nylon. Integral hinges for a secure open and close. Rubber temple tips for a comfortable, yet secure fit. Glass lenses provide the greatest clarity. 100% UV protection. 100% polarization cuts glare and reduces eye strain. Hard case included. All Costa sunglasses are handmade and backed by their lifetime warranty.