Zobrist said he wears the black cleats to pay homage to Cubs legend Ernie Banks and his St. Louis Cardinals rival Stan Musial, who both frequently wore all black cleats.
The 34-year-old veteran got some custom shoes, designed by new balance, that have big black tounges and another pair of PF flyers with "Benny the Jet" branding.
"I am curious as to why @mlb is spending time and money enforcing this now when they haven’t done it previously in the last year and beyond," Zobrist wrote. "I have heard nothing but compliments from fans that enjoy the “old school” look. Maybe there is some kid out there that will be inspired to look more into the history of the game by the “flexibility” that I prefer in the color of my shoes."
Zobrist wasn't the only one hearing from MLB after a cleat controversy, Cleveland Indians pitcher Mike Clevinger received a similar letter this week.
In response, Clevinger wrote, "Make baseball fun again, they said, it would be fun, they said....."
The letter reads, "You violated section A, which provides that,'Non alterations, writing or illustrations ... are to to be to any part of the uniform.' Various illustrations were visible on your shoes during you Club's May 1, 2018 game."
The cleats were mainly black with some pink trim and a white, drawn elephant with a ruby jewel.
Many players and shoe companies have come to the players' defense. PF Flyers tweeted a photo of Zobrist in a "Benny the Jet" pose wearing the shoes and his teammate Anthony Rizzo commented his support.
It appears that Zobrist, Clevinger and New Balance are not stepping down.