Zeal Optics is a boutique line of sunglasses, based in Boulder, Colorado, that was created to stand out from the indistinguishable masses of other performance frames. Zeal takes pride in its ability to constantly evolve and embraces the desire to be different. Zeal’s passion is driven by the need for adventure and the focus on the journey more than just the destination. All of Zeal's sunglasses frames are made with a patented Z-Resin™ material, which is made from castor beans and not crude oil, so they help adventurers enjoy the environment and take care of it as well.Zeal Optics Cascade is a Full Rim frame for Men and Women, which is made of Eco-friendly Plastic.Eco-friendly plastics are derived from a number of different environmentally friendly sources, including oil from castor beans. This natural oil is used in place of crude oil, so eco-friendly frames are created with sustainable materials and not fossil fuels. Eco-friendly plastic is as attractive, light weight, and durable as regular plastic. This model features a Square shape, with a Saddle Bridge.The Zeal Optics Cascade Sunglasses feature the following logo: Zeal name on the lens and Z logo on the templeThese Sunglasses work well for people whose style is: Sporty, Cool/Trendy.Ideal for usage with: Fashion, Sports, Driving, Water Sports, Snow Skiing, Beach Volleyball, Jogging, Everyday Driving, Water Skiing, Swimming, Fresh Water.Zeal Optics Cascade Sunglasses come with a cleaning cloth and protective carrying case.These sunglasses are available with polarized lenses on certain colors. Polarized lenses have a filter within the lens that blocks the wavelengths of light that cause glare. They can greatly enhance contrast and allow for greater depth of vision, especially in water. They are ideal for any situation where glare reduction is necessary, like driving or playing sports.