The wigs used onstage for Cats are generally made from Yak hair, take 40 hours to make, and are worth, according to different accounts, at least £1,800 (UK Tour) to $2500 (US Tour 5) or $3000 (original Broadway) The wigs are fully ventilated - every hair is knotted into the base by hand. Grizabella's wig is the exception - due to its length and softer styling, her wig has always been made of human hair as is more usual for theatrical wigs.