Modacrylic is a type of synthetic fiber made from a copolymer of acrylonitrile and other monomers. It is known for its softness, durability, and resistance to wrinkles and fading. Modacrylic fibers are often used in textiles, such as clothing, upholstery, and wigs, due to their ability to mimic the appearance of natural fibers. One of the key features of modacrylic is its flame resistance, making it a popular choice for safety clothing and furnishings. Additionally, it is lightweight and has good insulation properties, which helps keep wearers warm in cooler conditions.