Smith Optics Parallel Interchangeable Sunglasses are the result of Smith Optics' quest to develop the ideal interchangeable sunglasses. Smith Parallel Sunglasses are lightweight, contemporary, and performance driven, imagecombining cool style with an interchangeable lens system that makes these sport sunglasses infinitely adaptable. The Smith Optics style of interchangeable lens sunglasses utilizes distortion-free, 9 base Carbonic TLT lenses to provide precise optical clarity and maximize coverage while minimizing peripheral exposure to sun, wind, and glare. The Smith Optics Parallel Sunglasses Tapered Lens Technology polarized lenses ensure a distortion-free view through these outdoor sunglasses. The Smith Parallel Sunglass features the thin and flexible Grilamid TR90 frame, made of a resilient, tough, flexible and exceedingly light plastic that provides a universal fit and maintains its shape under temperature changes, to provides the gold standard platform for active Sunglasses. These Smith Optics Sunglasses are ideal for riding, driving or just cruising the town.