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What is fever fiber? What is the principle of heating fiber? Traditional insulation is based on preventing the escape of heat from the body. The heating fiber is a new material that heats up and warms the body, and its water absorption is far stronger than other varieties of fiber. It is a fiber that can generate heat after moisture absorption, such as eks fiber, softwarm fiber, etc. The so-called self-heating fiber has a limited function in terms of heat generation, because the heat energy generated can only be obtained from the skin respiration of the human body from the law of conservation of matter. At present, the degree of heat as a thermal underwear is about 3-5 degrees. At present, there is no standard for the definition of heating fibers in the textile industry in China, and most of the heating fibers are developed in Japan.