In the just past Spring Festival holiday, affected by the cold wave weather, the temperature in some parts of the country dropped sharply and was in the "fast freezing" mode. According to the information from the Central Meteorological Station, during the festival, the temperature in parts of Northeast and North China hit a new low this winter, and the lowest temperature in Mohe City, Heilongjiang Province even dropped to minus 53 degrees Celsius. In order to prevent the cold, even many young people who "need grace and not temperature" put on thick coats. However, if you want to keep warm, you don't have to wrap yourself into "zongzi". Now, the "black technology" used in winter clothes can help people "have both style and temperature". "The loss of human body heat is caused by heat transfer. There are three basic ways of heat transfer: conduction, convection and radiation." Xia Zhaopeng, senior engineer and doctoral supervisor of the School of Textile Science and Engineering of Tianjin University of Technology, said in an interview with the reporter of Science and Technology Daily. In order to achieve the thermal insulation effect, the cold-proof clothing in winter should be designed to reduce the loss of heat through these three ways as much as possible, Winter thermal insulation materials and clothing are also developed and designed around this principle. Imitation goose down: Even if it is soaked, it can achieve thermal insulation effect. "In winter, there is a huge temperature difference between the human body and the external low temperature environment, which causes heat conduction, that is, heat will be transferred from the place with high temperature to the place with low temperature. If you add a high-fluffy thermal insulation filler with low thermal conductivity to the clothes, it can prevent heat conduction, thus reducing the heat loss of the human body, and achieve the purpose of thermal insulation." Xia Zhaopeng said, This kind of thermal insulation filler mainly plays the role of blocking thermal insulation and conduction. At present, the more common natural materials are cotton, wool, down, etc., and the more common chemical fiber materials are hollow polyester, spray cotton, etc. Compared with the traditional thermal insulation filling materials, some new thermal insulation filling materials have emerged in recent years, among which the representative is the high thermal insulation wadding with goose down structure. This filling material not only has strong thermal insulation and portability, but also can keep warm continuously in wet environment. At the 2022 Beijing Winter Olympic Games, Chinese athletes used this kind of high thermal insulation wadding with goose down structure as the filling material in their winter clothing, which can still reach 98% of the thermal insulation rate under the fully wet condition. "The main component of the goose-like structure high thermal insulation wadding is the imitation goose-down, which is similar to the diameter and length of the goose-down fiber, and mixed with far-infrared polyester and hot-melt polyester." Xia Zhaopeng explained that the imitation goose-down is mainly made of hollow polyester and Y-shaped polyester, which can store the static air to the maximum extent, while the static air can better store the heat. In addition, hollow polyester and Y-shaped polyester can still store a certain amount of static air even when they are soaked in water. The goose-like structure and high thermal insulation floccule can overcome the shortcomings of natural goose down, such as bulkiness, peculiar smell, easy to run down and high price, and has the characteristics of ultra-light, ultra-thin, wet thermal insulation, high bulkiness, etc., and has good resilience after washing, no shrinkage, and no reduction in thermal insulation rate. Carbon nanotube heating film: heating when electrified, temperature can be controlled. The electric heating clothing made of heating materials is one of the most researched winter clothing at home and abroad. "Common heating materials include nickel-chromium heating wire, composite heating wire and carbon fiber