Spy Logan Sunglasses are one of those few products available out there that truly do provide the best of both worlds: they are stylish and fun to wear while at the same time, they are beneficial to health by blocking harmful UV Rays from damaging the retinas. Convenience has also been considered in their design in addition to practicality; a built-in hinge system allows for extra mobility and prevents damage to the structure of the glasses. Key Features of the Spy Logan Sunglasses: Built from bomb-proof Grilamid8-Base ARC lensesBUILT-IN HINGE SYSTEM100% UV protectionFrame measures: 60-15-121.5