The Seattle Sounders are MLS Cup champions, and your source for all of the very best official Seattle Sounders MLS Cup gear is MLSStore.com, the official online store of Major League Soccer. Get the new Sounders locker room champions tees, a Sounders champions scarf, or the Sounders 19 Champions Jerseys. Shop the entire collection of Sounders championship collectibles as well. We also have playoff slogan t-shirts for every team that made the postseason, as well as a more expansive line of MLS Cup conference championship apparel for the winners of the West and East. Get all the Sounders MLS Cup champs gear and any more MLS playoff apparel you need from MLS Store.