A heliostat is a device that reflects sunlight toward a target. Oakley Heliostat OO9231 Prizm Water Polarized Sunglasses build on that idea, incorporating wraparound styling and upgraded lenses. HDPolarized to cut glare, Plutonite polycarbonate lenses filter 100% of all UVA/UVB/UVC and harmful blue light. These Oakley fishing sunglasses feature Prizm technology that helps fine-tune your vision for specific sports and environments by maximizing contrast and enhancing visibility. With a 12% light-transmission value, Prizm Water lenses are well-suited for bright light and are specifically engineered to help you navigate the challenges of offshore fishing. High-wrap O Matter frames are lightweight and stress-resistant, with tall temples to block light at the sides of your vision. Unobtainium ear socks and nose pads ensure a Three-Point Fit. Oakley polarized sunglasses include a microfiber cleaning bag and a mfrs.