Ken Griffey Jr. Cincinnati Reds Mitchell & Ness Cooperstown Collection Medium. Start game day off right with this Cincinnati Reds Ken Griffey Jr. Cooperstown Collection Mesh Batting Practice jersey from Mitchell & Ness. This throwback piece features the number of your favorite player of all time. Its mesh fabric is great for when you're in chill mode or on the go, so get comfortable in this Ken Griffey Jr. jersey this season.