These Lamone Sunglasses from Serengeti are mounted in a Titanium frame. Streamlined elegance and clean, spare lines characterize this future classic. All Serengeti lenses offer the latest in photochromic technology, which constantly lightens and darkens throughout the day to ensure you see every detail.The revolutionary S-Flex design employs a mix of monel and beta titanium metals for a supremely durable, lightweight frame. It is also engineered with the S" shaped temple design, providing a snug fit and unparalleled comfort. Some Wire-Flex frames with leather-like Tannery finishes are available in select styles.