There is a triangle at the back, some wear pants with two lines at the back and one line at the back. If you look closely, you can see that when the pants are closed, the middle will be tilted like a place, and there will be a back.

Some autumn trousers or leggings are not front and back, but the brand of autumn trousers or leggings with higher comfort is almost front and back. Autumn trousers are usually one in front and two in the back, with a vertical line in front and two vertical lines in the back. Trademarks, washing labels and ingredient lists are generally sewn on the back of autumn trousers.

Extended data:

Benefits of wearing long pants in winter:

1, protect the knee joint

As an important load-bearing joint of human body, knee joint is most afraid of cold, especially in autumn and winter, which is not only low in temperature, but also often accompanied by cold wind. In just a few minutes, the cold wind will attack the unguarded knee joint and make it cold.

Step 2 improve resistance

In all parts of the human body, the legs and feet are far away from the heart, which not only makes the blood flow a long distance, but also brings together the meridians of the whole body. Therefore, when the feet are cold, the whole body will be cold, and the body's resistance will drop, and the virus may take advantage of it.

3. Prevent low back pain and leg pain

If you don't pay attention to keeping your legs warm in the cold season, it will cause low back and leg pain, sciatica and knee pain year after year.

4, to prevent harm to the body

Although young people have good heat-producing function, long-term exposure to wind, cold, wet and cold environment is easy to cause physical damage, such as blood phagocytosis and myofibrositis, and they will develop diseases one after another after middle age, laying a hidden danger for their health in their later years.