Technical innovations continually influenced female appearance during the nineteenth century. Not only were textile production and sewing capabilities improved, but cutting-edge processes shaped the body with steam-molded corsets stiffened with watchspring-steel boning. The 1870s and 1880s were the era of bustles, posterior protuberances that swayed seductively back and forth as their wearers walked. In the early 1870s, the bustle was full and round. The bustle of the 1880s perched directly on the buttocks, jutting out ninety degrees from the hips. This extreme example is an engineering feat. Not only does it contain three divisions of sprung, coiled steel encased in polished cotton pouches, it also features a hinged understructure that did not fully compress when its wearer sat down, forcing her to teeter on the edge of her seat.