Follow the fish with the Costa Del Mar Tuna Alley Sunglasses. Featuring integral hinges for ease of wear, Costa's patented venting system for fog-less lenses, and a tough-as-nails nylon frame for maximum durability, these sunglasses are the perfect mix of style and function. The Costa 400 lens is designed for adventure and built to perform with superior clarity, contrast, and definition. These durable 400G lenses are made of LightWAVE glass that's 20% thinner and 22% lighter then the average glass lens. The right sunglass tint is important, and with the Green Mirror tint you get a lens that offers advanced visual acuity. Perfect for fishing inshore, flats, rivers, and streams, these lenses allow a minimal 10% light transmission.Every pair of Costa sunglasses features 100% polarized lenses, providing complete UVA, UVB, and UVC protection., as well as a lifetime warranty against defects in materials and workmanship.