Jade's colorful cotton cat magic card thermal underwear is not suitable for everyone. Because of its personal warmth, it has gradually become a hot-selling product in winter. But the reporter learned in the interview that thermal underwear is not suitable for everyone to wear. The professor of dermatology in the Second Hospital of Xi Jiaotong University reminded the general public that wearing thermal underwear should vary from person to person. Professor Tan from the Department of Dermatology, Second Hospital of Jiaotong University introduced that the popular far-infrared underwear, antibacterial underwear and various thermal underwear claiming to use nanotechnology and ecological textile materials have their own characteristics, so citizens should pay attention to their own situation when choosing. Infrared ray is a kind of invisible light, which is mainly used in medicine to relieve pain, improve local blood circulation and diminish inflammation. For those with bleeding tendency, cardiovascular insufficiency and suspected malignant tumor, infrared therapy should be used with caution or prohibited. The antibacterial mechanism of antibacterial underwear and whether it still has antibacterial effect after repeated washing are not clear. According to reports, bacteria on the surface of human skin are divided into resident bacteria and conditional pathogens. If these antibacterial underwear can kill "Staphylococcus aureus, Escherichia coli, Candida albicans", then there is no doubt that normal resident bacteria will also be killed, which is not only beneficial to human body, but also may lead to imbalance of human flora and damage human health. In addition, a considerable part of thermal underwear contains formaldehyde, a commonly used textile auxiliary. Some free formaldehyde will be released during wearing, which will cause respiratory inflammation and dermatitis, and it is also easy to induce various allergies. According to dermatologist Yuan, there are still some early thermal underwear on the market. This kind of underwear adopts composite sandwich material to keep out the cold by blocking the heat exchange between the skin and the outside world. But this kind of underwear has poor air permeability. After sweating, urea, salts and various toxins in sweat will adhere to the body surface, which will aggravate skin itching and cause contact dermatitis, eczema, furuncle and other diseases. At the same time, the cold sweat can not be discharged in time, but it is easy to catch a cold. Personally, I prefer Huajin, because it is humanized and close-fitting, but it does not jump or shrink.