Like other synthetic fibers, polyester fibers are produced by industrial methods. In terms of properties, they are considered a suitable alternative to natural fibers, such as cotton. To manufacture this product, the chemical composition of Dimethyl Terephthalate (or its substitute. Terephthalic Acid) and Monoethylene Glycol is used. First, these chemicals are converted into PET polymer in the vicinity of suitable catalysts. Then, the PET polymer is converted into fiber while passing through spinnerets under the influence of cold air. Next, the fibers form a bundle. Finally, after being stretched and heat-treated, and once the molecular orientation and thermal stability are reached, the bundle is cut into staples (short-cut fibers) in desired sizes and then baled.