Look great and see clearly in the Costa Del Mar Hamlin Sunglasses. The stainless steel inegral hinge allows for easy on/off access, while the TR 90 nylon frame delivers rugged durability that allows you to bring these sunglasses on any adventure no matter the conditions. The Hamlin sunglasses feature Costa 400 lenses, which are designed for adventure and built to perform with superior clarity, contrast, and definition. These durable 400G Lenses are made of LightWAVE glass that is 20% thinner and 22% lighter then typical glass lenses The Blue Mirror lens tint is made for the open water, and delivers maximum contrast and color in full sun while eliminating glare. It also allows a minimal 10% light transmission. Each pair of Costas features 100% polarized lenses, providing complete UVA, UVB, and UVC protection, as well as a lifetime warranty against defects in materials and workmanship.