The answer is a mixed blend of human and synthetic fiber. Theatrical and fashion wigs are usually built from a hair blend to keep costs down.
That's a different build than an everyday, ready-to-wear wig, which is typically pure synthetic fiber, or a premium piece, which might go 100% human hair. For short-run stage or costume use, a mixed blend holds a style well enough without the price tag of an all-human-hair piece.
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