A large part of the success of Assisi sunglasses is the Polar PhD lens. Tapping both polarization and photochromatic technologies, the view through the lenses is pleasing. Reflections are minimized, and the sky is appealingly darkened. Made of Trivex, the Polar PhD lens is claimed to be 10-percent lighter than polycarbonate, while also being more impact resistant.When we were out riding, the Serengeti Assisi eyewear received some hard use, so the company’s claim of a double-sided hard coat technology on the lenses appears to have merit. Stylish, durable, and effective, the Assisi sunglasses work.The Serengeti Assisi sunglasses start at $169.99. For additional information, click here.