Model 201 features a unifit nylon frame that is lightweight and durable. Perfect for motorcycle riding. Sporty, wrap around design is comfortable and provides protection from sun and wind. Clear Glass – Clear glass has been used since the dawn of the safety industry. Its optical quality is higher than that of any other material used through out the optical industry. Unlike plastic lenses, Clear Glass is naturally scratch resistant and has the least amount of distortion than any other lens material.