Spandex stretch fiber is mixed with other fibers to spin stretch yarn. There are currently three forms of its yarn: spandex core-spun yarn, spandex twisted yarn and spandex covered yarn. The three forms of yarn have essential differences in processing principles and structural properties. Therefore, their uses and weaving properties are also very different.

The main properties of spandex are: usually more than 500% to 700% elongation, good elastic recovery performance. It shrinks 97% when it is elongated by 200%, and shrinks more than 99% when it is elongated by 50%. The relative density of various spandex is relatively small, generally 1.20-1.25, and the breaking strength is 4.41-8.82 cN/tex (0.5-1.0 g/denier). The strength of polyester spandex is lower, while that of polyether spandex is higher. The moisture absorption rate is generally 0.3%-1.2%, and the moisture absorption rate of multifilament is slightly higher than that of monofilament. The heat resistance is generally 95-150 degree , and short-term storage will not damage the fiber. The safe ironing temperature is below 150 degree . The fiber burns slowly and forms a gelatinous residue after burning. It has excellent dyeing performance, can be dyed in a variety of colors, and has a strong affinity for dyes.

The dress is made of four-sided stretch suede fabric. The fabric is added with 40D spandex, and the spandex content accounts for 10%. It is close-fitting, comfortable, and soft, all thanks to the spandex!