Amphibia Depthcharge Baja Bronze Sunglasses, Tortoise Our Depth charge line uses our titanium flex bridge and Ariel technologies; This line has an Extreme Flotation Rating All of our lenses have anti-reflective coating that not only helps eliminate fogging but also provides 30% more scratch reduction All Amphibia lenses block 100% of all UVA, UVB, and UVC rays, are 100% polarized lenses with Aquaphobic Coating on both front and back To repel water and other substances