Fully-drawn yarn (FDY), the production process is similar to the POY process, with the exception that it is fully custom-made for the thermal and stretching of the yarn, and is produced at high speed and seamlessly. Sirang Co. is one of the few high-shrink yarn manufacturers in Iran. FDY threads use different types of shrinkage in different areas of the textile industry. For example, FDY threads with a high shrinkage are used in the fabrication of cloth and curtain fabrics, creating a bloated structure on the fabric surface. Low-shrink FDY threads are widely used in the Rachel blanket industry.