There are also many "plastics" used to make clothes, such as common polyester (polyethylene terephthalate fiber), nylon (nylon 66 fiber), Lycra and so on. People often think that clothes are made of natural fibers (cotton, hemp, silk, etc.). ) are breathable and comfortable to wear, but this is not necessarily the case. The comprehensive properties of man-made fibers and fabrics prepared by modern textile technology have surpassed natural fibers to a great extent. Even in the clothing fabrics that claim to be "100% pure cotton" in the market, a certain proportion of man-made fibers are mostly added to improve their performance in some aspects.