Now, they're selling shirts to raise money for the entire league.
Both Dan Auerbach and Patrick Carney played Little League in Akron. The money from the shirts will benefit the West Akron Baseball League. The shirts were designed by Carney's brother, Michael.
According to MTV, the funds will go to keeping registration fees low, buying uniforms, replacing benches and backstops at several fields, and upgrading equipment like catcher's gear and bats.