In 1958, Chevrolet introduced its new full-size passenger cars, redesigned from the ground up with a new frame and sheet metal. A new up level, sporty trim package was created for Bel Air coupes and convertibles, along with a new name - Impala. The Impala began as the top option level on Chevrolet's Bel Air line. Chevrolet's 1958 lineup featured one-year-only styling that sported "curves where before there were lines." The Impala option added special trim, deluxe interiors, and resulted in the steepest price in the Chevrolet lineup.