he beauty of Serengeti S-Flex Salto Sunglasses travels well below the surface. The secret is Serengeti 's advanced lens technology that helps you take control of the road, constantly adjusting to changing light conditions as you drive. Comfort, clarity and a better view of the road - experience it once and you'll never travel without Serengeti Sunglasses again. Serengeti Salto Sun Glasses - the ultimate sunglasses for driving � or wherever the road takes you. But technological advances aren't reserved for Serengeti lenses alone. Serengeti S-Flex Salto Sunglasses feature the "S" shaped temple design, that working with the strength of monel and beta titanium, provides a double action movement without using a traditional spring hinge. The unique design of Serengeti Salto SFlex Sun Glasses provides just the right amount of tension to ensure a comfortable, secure fit that is remarkably lightweight and durable.