Chicago Cubs fan and Pearl Jam lead singer Eddie Vedder.

Dennis Wierzbicki USA TODAY Sports

Pearl Jam is joining Eddie Vedder on the Chicago Cubs train as they enter into the National League Championship Series.

The rock band's online store is taking advantage of the momentum, creating cool "Northsider" shirts for men and women in honor of Chicago-area native Vedder's team.

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The logo is "EV" and on the back is the number 15 with the name VEDDER.

"October is time to take the world seriously!" the shirt description reads. "Celebrate the season, at home or away, with the EV Northsider shirt."

"We hope that this will go all the way and become a new fall classic."