Synthetic fiber created in 1947 in the U.S. It is light, color-fast, acid-resistant, and can be used in any climate condition. It doesn’t become matted or creased, dries quickly and doesn’t need ironing. Thanks to its property of retaining heat, it is used in winter clothing especially. Its label name changes according to the manufacturer (Courtelle, Orlon, Dupont, Dralon, Bayer).