When your young baseball fan is as die-hard a Seattle Mariners supporter as you are, they deserve the best game day gear. Help them arrive in style when they sport this Ken Griffey Jr. Cooperstown Collection Mesh Batting Practice jersey from Mitchell & Ness. This cool jersey features classic Seattle Mariners graphics along with Ken Griffey Jr.'s name on the back, so casual and devoted fans will know which player gets your young fan fired up. Best of all, its lightweight mesh offers a breathable feel, so they'll stay cool while they cheer through every inning.