Your source for authentic Seattle Mariners Jersey is the MLB Shop, the official online store of the Seattle Mariners. Shop for player jerseys, official and popular throwback hats, locker room apparel for men and women, and much more. Browse exclusive collectible memorablia, including autographed merchandise and game-used equipment. We have apparel for men, women, and youth for any season so you can show your Seattle pride all year long. the official MLB Shop is the online source for every Seattle fan's needs.