Mark your territory as the biggest MLB fan around when you get your hands on an officially licensed Seattle Mariners long sleeve T-shirt from the MLB Shop. You’ll find an impressive array of the latest and greatest Seattle Mariners hooded, oversized, and ¾-sleeve T-shirts to fit your game day needs. You can celebrate the history of your favorite MLB team with a classic Seattle Mariners throwback or vintage Seattle Mariners Cooperstown long sleeve T-shirt. Every type of fan will be able to find a style of Seattle Mariners long sleeve T-shirt that’s right for them in the selection of Seattle Mariners crew necks, V-necks, and raglans available at the MLB Shop. You’ll be impressed with the broad range of options offered in the shop to help you create the perfect game day ensemble. We’re fully loaded with Seattle Mariners ombre and could-shoulder shirts to match whatever chic style you’re looking to show off. Whatever look you’re going for, at the MLB Shop you’re guaranteed to find an officially licensed Seattle Mariners long sleeve T-shirt to accurately represent your fandom on game day.