One important basis for these innovations was created when synthetic textile fibers were developed in the first half of the twentieth century. Before that time, clothing consisted of natural fibers such as linen, wool, and silk. In 1935, the DuPont company started selling the first synthetic fiber, which was made of polyamide. Nylon stockings, which were launched on the market on May 15, 1940—“N-Day”—immediately became a bestseller. On that day alone, five million pairs were sold in the USA. During the war years, synthetic fibers were needed for military equipment such as parachutes, tents, and ropes. As a result, nylon manufacturers promptly restricted their production of nylon stockings. They were sorely missed—in fact, surveys of American women showed that nylons were missed even more than the men who had gone to war.