'Stranger Things' hairstylist explains how she squeezes Joe Keery's hair 'like a cat' to achieve his massive bouffant

• "Stranger Things" star Joe Keery is one of the few stars on the show who doesn't need a full wig.
• The show's hair department head told Mashable that she uses a "cat paw" technique to swoop his hair.

Joe Keery may not need a full wig like his costars on "Stranger Things," but he still has to undergo a ritual in the hair and makeup chair every day on set.

"We put products in [his hair] and then you squeeze like a cat," Sarah Hindsgaul, the hair department head on Netflix's series, told Mashable in an interview last week.

Mashable reporter Belen Edwards said Hindsgaul "demonstrated by kneading her hand just like a cat paw."

"I get all the texture into it and dry it hard into his hair so we get that wave texture," Hindgaul said. "Otherwise, it gets really straight."

Keery's bouffant hairstyle is a signature part of his character's endearing appearance. Throughout the show, he's joking referred to as "Steve 'The Hair' Harrington" by classmates and friends. Hindsgaul said she sometimes adds extensions to the back of Keery's head in order to add to the mullet shape, but those puffy bangs are all Keery.

The actor recently told The Daily Beast that he doesn't understand all the hype about his hair, both in the show and out on red carpets during interviews.

"I have a career, so I have to be like, 'Who cares? I'll take it,'" Keery said. "But it's also not something I care about at all. Still, people seem to really care about it and fixate on it, for whatever reason. It's so stupid, honestly."

For more on the behind-the-scenes magic of "Stranger Things," read our roundup of 19 filming secrets and fun facts you probably didn't know.