Notably, the New York Yankees have a strict hair policy. Their players cannot have hair that touches their shoulders, nor can they have any facial hair other than a well-kept mustache. Some players have that, while others completely shave everything off.
During the season, players' facial hair grows. It's inevitable, and it's something that they all have to be mindful of. When it gets out of hand or they have gone too long without shaving, Aaron Boone will step in.
On the "Talkin' Yanks" podcast, which Aaron Boone joins every week, he was asked who enforces the rule around the clubhouse. He joked:
"It's a village. If I saw you with this stuff on your face today, I'd be like, 'Your shoulder all right?"
"Oh yeah, I'm fine. Fine," Jake Story said.
Then get the razor and get it going. Let's go.' I pull that Dad joke a lot," Boone jokingly responded.
Boone has no facial hair himself, and most of the Yankees players don't, either. Austin Wells, Carlos Rodon, and Nestor Cortes Jr. notably have mustaches, though.
Yankees hair policy came into play at the trade deadline
During the MLB Trade Deadline, any player who is linked to the New York Yankees must be prepared for a haircut and a shave. Jazz Chisholm Jr. didn't have facial hair, so it didn't matter. Mark Leiter Jr. did, though.
Leiter was traded from the Chicago Cubs to The Yanks on the afternoon of July 30. That evening, he was on the mound preventing the winning run in the 10th inning. In between, he had to shave.
In the above interview on "Talkin' Yanks," Jake Story mentioned to Boone that Leiter showed up a little questionable on the hair. They were willing to cut him a bit of slack since he was unlikely to play on day one and had just been on a different team the day before.
Leiter ended up keeping the ghost runner from scoring, which proved to be huge since the Yankees hadn't scored in the top half, either. They went on to win 6-5 and eventually swept the Philadelphia Phillies 3-0 in the series as a result.