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 Big Timber is a Full Rim frame for Men, which is made of Z Resin.Z Resin is a truly unique and patented Eco-friendly material that is made with sustainable castor beans instead of crude oil. It is just as strong as original crude oil based materials but leaves a much lighter carbon footprint. This model features a Wrap Around shape, with a Saddle Bridge.The Zeal Optics Big Timber 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.Ideal for usage with: Sports, Driving, Everyday Driving.Zeal Optics Big Timber 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.These sunglasses are available with photochromic lenses on certain colors, which are light sensitive and adjust to varying light conditions. The color goes from dark in sunny conditions to clear in cloudy or indoors conditions.