The key to keeping your upper body warm when running in winter is to wear more layers of clothes. Seemingly simple, in fact, it needs scientific and reasonable collocation. Because these layers of clothes should not only keep warm, but also breathe and sweat-quickly distribute from the innermost layer to the outermost layer, so as to avoid being stuck by cold and wet underwear. Andy's experience is to wear long-sleeved compression clothes inside, short-sleeved quick-drying clothes outside and an ultra-thin trench coat in his pocket. The following is the collocation method of upper body clothes (generally three layers can be worn)

1, sweat-absorbent underwear. The innermost layer of clothes should be made of high-tech fabrics or silk. Its function is to quickly absorb your sweat and keep your body dry and warm. Don't wear cotton underwear for outdoor running in winter, unless you want to experience the feeling of "cold ice and rain surrounding me". When the outdoor temperature is above 5℃, you can even wear a long-sleeved sports bra made of this fabric when running. 2. Thermal insulation layer (intermediate layer). This layer of clothes has a good heat insulation effect (such as wool), which is necessary when the outdoor temperature is below-17℃. This kind of clothes can not only expel sweat from the body in time, but also keep the body temperature; It is also necessary to be able to dissipate heat properly to prevent overheating. 3. Outer layer (windproof waterproof layer). This layer of clothes should protect you from wind and rain, and at the same time, it should be breathable to prevent your body from overheating or sweat from freezing. This dress had better have a zipper, which can adjust the temperature. When the outdoor temperature is between-17℃ ~ 5℃, you don't need to wear an intermediate layer when running, you can wear a sports bra inside and such clothes outside. If you participate in the competition, it is recommended to choose a disposable raincoat, which is cheap. It's not a pity to tear it off while it's hot. Don't throw it in the middle of the track, it will easily trip others. 4. gloves. 30% of the body's heat is lost through the limbs, so running outdoors in winter, hands are also the focus of keeping warm. Generally speaking, a pair of thin gloves with fingers can meet the needs, but when the weather is particularly cold, it is best to wear thicker mittens. Andy Chen used to believe in evil spirits, and running every morning would give him a headache. Later, he learned his lesson and took a pair of white work gloves with him. Talk is better than nothing. If you take part in the competition, it is recommended to choose work gloves, which are cheap and it is not a pity to throw them away halfway after running hot.