Gear up for October baseball and show your unwavering support for the Seattle Mariners with this 2025 MLB Postseason Locker Room T-Shirt from Fanatics. This tee commemorates the Seattle Mariners' hard-fought journey to the 2025 MLB Postseason, making it a must-have for any die-hard fan. Crafted from soft cotton with a classic fit, this comfortable crew neck shirt proudly displays graphics matching those worn by the team, so you can cheer on the Seattle Mariners in style throughout their playoff run.