Clarification time: NFL, NBA balls still leather

Someone made a comment elsewhere that the balls used in the NBA and NFL weren’t leather anymore, but the thread got a little busy and I figure it might be a common misconception, hence the front page post. While the NBA did make a switch to a synthetic ball, the leather one returned on Jan 1. As for football, they’re all made by Wilson Sports, and as you can see on their website, they’re leather as well. Now for the quiz of the day: what’s the most major sport with the least animal products used?