At present, there is no textile standard or recognized law about bra fabrics. "Lycra is the trade name of spandex produced by DuPont in the United States, that is, elastic fiber. General clothing plus 3%-5%, plus 7% here, is more elastic, indicating that it is very tight to wear. " Zhang Tianjiao, an associate professor at the Institute of Clothing Science and Technology of Beijing Institute of Fashion Technology, said, however, huge somatosensory pressure will only make people uncomfortable to wear, and it can't burn fat.
Zhang Tianjiao introduced that shape memory fiber is an intelligent polymer material with clear definition and connotation. For example, a hat made of this material is subjected to high temperature treatment and cooled to flatten the hat. When the temperature reaches the temperature of processing the hat again, the hat will expand itself and return to its original state. Memory fibers are now usually made of polyurethane. I think some bras have introduced bamboo fiber, which may be the finishing of polyurethane material; It is also possible that we just borrowed the concept of shape memory and didn't really make the shape memory fiber in the professional sense of our industry. "Zhang Tianjiao said.
Others claim that putting on body shaping can not only create a beautiful figure curve, but also make muscles and fat "remember" this shape, which can really become thinner after a long time.
Wang Anli, former director of the Department of Sports Rehabilitation of Beijing Sport University, said that wearing body-shaping clothes only covered up obesity, changed the sensory form, and was only a kind of spiritual and psychological comfort. Because fat is an energy substance, if the human body does not do "work" and does not burn, it will stay in place. It is impossible to lose weight by lying still just by wearing a corset. "And wearing corsets for a long time will also bring side effects to the body." Wang Anli said that people who wear corsets for a long time will not only tighten their flesh, but also have a series of changes in the position of internal organs, the size of ribs and arches, just like "foot-binding", which will waste and atrophy some muscles. After taking off their bras, their bodies will not look good, and they will become very loose. Long-term wearing will affect blood circulation, slow local metabolism, poor nutrition supply, and further decrease muscle strength and joint stability. Over time, the disadvantages outweigh the advantages. If you get used to wearing it and suddenly stop wearing it, you are more likely to get hurt. (Yang Xue)