Spandex covered yarn refers to the thread used for stitching textile materials, plastics, leather products, and sewing books and magazines. The sewing thread has the characteristics of sewability, durability and appearance quality. Sewing threads are roughly divided into three types due to their different materials: natural fiber type, chemical fiber type, and mixed type; the characteristics of sewing thread also have its unique properties due to the difference in materials: Cotton sewing thread ---Good heat resistance, poor elasticity, abrasion resistance, moisture resistance, and anti-bacterial ability, suitable for high-speed sewing and durable pressing. The most used long-staple pure cotton thread: It is made of long-staple cotton through combing, singeing, mercerizing, and high-density twisting, so the tensile force is better than ordinary combed cotton. Often used for pure cotton clothing and other pure cotton fabrics for sewing purposes Specifications 20/2 (60/4), 20/3 (60/6) 40/2, 40/3, 20/9 Pure cotton thread: Generally divided into two parts: carded and combed. High-strength polyester sewing thread, real 100% cotton thread, can be used for sewing, which is fully combed cotton. Generally use 402, 202, 203 more. It is made by combing and singeing high-quality cotton in the cotton area. Pure cotton thread is often used for sewing pure cotton clothing and other pure cotton fabrics.