What kind of fabric is underwear made out of?

1. Cotton: Cotton is a natural fiber that is soft, breathable, and absorbent, making it a popular choice for underwear. Cotton underwear is comfortable to wear and can help to prevent chafing and irritation.

2. Polyester: Polyester is a synthetic fiber that is wrinkle-resistant, quick-drying, and durable. Polyester underwear is often blended with cotton or other fibers to improve comfort and breathability.

3. Nylon: Nylon is a synthetic fiber that is strong, elastic, and wrinkle-resistant. Nylon underwear is often used for sportswear or other activewear because it can wick moisture away from the skin and help to keep the wearer cool and dry.

4. Spandex: Spandex is a synthetic fiber that is highly elastic and can stretch up to five times its original length. Spandex is often blended with other fibers to improve the fit and comfort of underwear.

5. Silk: Silk is a natural fiber that is smooth, soft, and luxurious. Silk underwear is considered to be a high-quality and expensive option, but it is also very delicate and requires special care.

In addition to these five main fibers, underwear can also be made from other materials, such as wool, bamboo, or modal. The choice of fabric for underwear depends on the desired properties and the individual's personal preferences and needs.