In sports, it is worn as a close-fitting sportswear or equipment in the innermost layer of clothes, and can also be worn in training or other fitness activities. Mainly to keep dry, remove moisture, proper ventilation, get a cool feeling, reduce friction and so on. Mainly to protect a certain part, or to reduce the friction of clothes on the body.

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Tight pants, also called underpants, are tight pants from waist to toes. Because it looks like pantyhose, it is also called inner socks and bottomless socks. 1In the early 1980s, it was a fashion for women to wear tights for fitness and aerobic exercise. Since 2005, the fashion trend is to wear miniskirts with black tights. Some people also call it "putting socks inside", which belongs to pantyhose. It's a sock that can't cover the soles of your feet. When wearing, the sock mouth is roughly between the knee and ankle. Like pantyhose, there are many materials, such as cotton, nylon and wool blended.