NFLPA president JC Tretter is asking for the NFL to improve playing surfaces to decrease unnecessary injuries. Tretter, after taking feedback from players who have expressed concern about some of the league's playing surfaces, has asked the NFL -- among other things -- for an immediate ban of slit film turf.

Slit film turf is currently used in six stadiums: MetLife Stadium (New York Giants and New York Jets), Ford Field (Detroit Lions), U.S. Bank Stadium (Minnesota Vikings), Caesars Superdome (New Orleans Saints), Lucas Oil Stadium (Indianapolis Colts) and Paycor Stadium (Cincinnati Bengals).

In a letter issued through the NFLPA's website, Tretter noted that games played on slit film turf have higher in-game injury rates compared to other playing surfaces. Non-contact injuries and foot and ankle injuries are among the injuries that statistically occur more on slit film turf, according to Tretter. 

"The NFL and its experts have agreed with this data and acknowledge that the slit film field is less safe," Tretter wrote. "Player leadership wrote a letter to the NFL this week demanding the immediate removal of these fields and a ban on them going forward, both in stadiums and for practice fields. The NFL has not only refused to mandate this change immediately, but they have also refused to commit to mandating a change away from slit film in the future at all."

Tretter is also asking the NFL to not allow games to be played on fields with clear visual abnormalities. He also wants the NFL to raise the field standards and test the safety and performance of all field surfaces. Lastly, Tretter called on the NFL to clear excess people and dangerous equipment from the sidelines. 

"We play one of the most dangerous sports in the world; it shouldn't be more dangerous because the clubs won't do anything to remove the simple injury risks on practice and playing surfaces," Tretter wrote. "If the league wants to actually use data to drive its decisions, then do it already. We've been waiting for years for some of these changes."

Tretter's concerns regarding slit film turf have merit. Just ask the 49ers, who lost a host of players in 2020 after San Francisco played games at MetLife Stadium, which is one of the stadiums that currently uses slit film turf. Richard Sherman, a 49ers cornerback at the time and currently the NFLPA vice president, called on the NFL to ban slit film turf while using his spotlight as an Amazon analyst for Thursday night games. 

"It needs to change immediately," Sherman said, via "The league champions player safety. And when there's clear evidence of a playing surface being dangerous -- there's nine more serious injuries on this surface than even other turfs -- like, you need to change it now. 

"You get on it immediately. There has been 15-18 more injuries just this season. So that data that they compiled hasn't included this season. … As a player, there's no reason for that kind of risk. These are outdoor stadiums. … They can change that. The indoor stadiums -- cool, there's an argument there. But when you can change the surface, it should be grass. … Player safety is nonnegotiable."