Hatchbacks were the big trend of the 1970s. Within a few years almost all small cars had adopted the front-engine, front-wheel drive layout and the semi-estate body style with three or five doors to add practicality. Fold-flat rear seats provided even more versatility. The seats were also split—one side could be folded but the other left in place for passenger use—extending the adaptability of the hatchback. Hot hatches, such as the Volkswagen Golf GTi, added performance and modern sports-car styling but retained most of the practicality. They proved immensely popular.