The registered trademark name of spandex yarn produced by DuPont company in the United States. Spandex is a kind of elastic fiber, formerly known as K fiber. Its special composition makes it have good elasticity, which can be extended to 5 to 8 times of its original length and can be completely recovered after external force is removed. Lycra was once called the magic fiber by very happy people, and it was named the Egyptian Sphinx, which is even more mysterious.

Lycra is only a trade name of DuPont, but because of its monopoly position in this field, Lycra has become synonymous with almost all spandex yarns. It completely replaces the traditional elastic rubber thread. Lycra is almost an essential component in clothes with special requirements, such as gymnastics clothes and swimming suits. You can expose your curves, and the colloid can stretch freely without oppression. Lycra is not only widely used in daily clothes, but also a pet in a popular kaleidoscope made by fashion designers.