Gear up for October baseball and show your support for your favorite team by grabbing this 2025 MLB Postseason Locker Room T-Shirt from Fanatics. As the Seattle Mariners make a push for the World Series, rock this tee and show your appreciation for the team's postseason run. The playoff graphics. matching those worn by the Seattle Mariners, make it clear you're a die-hard fan, while the soft cotton fabric and relaxed fit provide all-day comfort. This shirt is a must-have for any fan looking to celebrate their team's success in style.