Underwear is clothing worn next to the skin, usually under other clothing, wearing underwear is mainly for hygienic reasons, but it also provides support, a higher wearing comfort and more privacy. In cold weather, extra long or thick underwear is sometimes worn, some types of underwear are worn for erotic reasons. Different types of underwear can also be worn as nightwear. In addition, underwear can also have a religious function. What is and isn't underwear depends largely on social norms, fashion, and laws. Underwear can be divided into tops and bottoms, with the first covering the torso and the second (underpants) worn below the waist. There are pieces of underwear that cover both parts. Common garments for women are the bra and briefs, while men wear briefs or boxer shorts. Underwear has multiple functions. One of the reasons people wear underwear is to protect their clothes from dirt such as sweat or urine. In addition, underwear sometimes offers support. For example, a bra can provide support for the breasts, while briefs have the same function for the male genitals. Some underwear such as a corset can be used to temporarily change someone's body shape. There is also special underwear that provides support during exercise. For example, there is underwear with a toque and there are sports bras that offer more support. In colder parts of the world, underwear also serves as an additional insulating layer, keeping the wearer warm. Underwear can also be worn for modesty. Lingerie is another word for women's underwear and sleepwear,