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Looking for a new Seattle Mariners t-shirt? MLB Shop has everything you need. Get player shirts that look just like their jersey, find locker room t-shirts, ballpark tees, and much more. We carry top brands like Majestic and Nike and have styles for men, women, and kids. Wear your Seattle Mariners t-shirt to the ballpark, to the gym, or just around the house and show everybody where your loyalty lies. Treat the Seattle Mariners fan in your life with a great shirt or just treat yourself. Whoever you're shopping for, the source for the best Seattle Mariners t-shirts is MLB Shop.