You know, you can run barefoot, because when you run, your body will produce a lot of heat and sweat, and it is more conducive to discharge without clothes. However, after running, I put on my sweater without zipper. In a short time, the heat and sweat in my body were sent away, but my pores were still open, and gradually the cold and humid air entered my body through the pores. If I have a strong immunity, I may just manage. If my immunity is poor, I may have cold symptoms in a few minutes. Therefore, I suggest you not to be too careless in the future. Health is your most important capital, so cherish it!