The answer is mixed. Milady describes mixed hair products — human hair blended with synthetic or animal hair — as commonly used to manufacture theatrical or fashion wigs.
That's a different answer from a closely related question on the everyday-wig side of the same chapter: ready-to-wear wigs are typically pure synthetic fiber (Kanekalon), while theatrical and fashion pieces lean on blends, sometimes including materials like horse hair, yak hair, angora, or sheep's wool for a specific look.
Milady Standard Barbering, 6th ed., Ch. 15 (Men's Hair Replacement), p. 500: "Mixed hair products, such as human hair blended with synthetic or animal hair, are often used in the manufacture of theatrical or fashion wigs."
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