General pants, women's pants are about 1. 1 m, and men's pants are about 1.2 to 1.4 m. So a pair of thermal underwear needs about 1.5 to 2 square meters of cloth.

The so-called warm pants, because of their versatility and rich selling points, meet the multiple needs of most women, so merchants give them many names according to the hot demand in different markets, such as boots pants, warm pants, body pants and so on.