Wigs are usually made from human hair, synthetic fiber, animal hair, or a blend. The material affects price, realism, heat tolerance, longevity, and care.
Human hair
Human hair moves and styles most naturally, but it costs more and needs washing, conditioning, and heat styling.
Synthetic fiber
Many synthetic wigs use man-made fibers such as modacrylic. These fibers are designed to hold style and mimic hair, but normal hair dye and high heat can damage them.
Animal hair and blends
Historically and in some specialty uses, animal hair such as yak, goat, or horse hair may appear. Blends combine materials to balance cost and appearance.
Bottom line
What a wig is made of determines how it behaves. Always check the fiber before washing, coloring, or heat styling.