SALEM VOLCANOES Minor League 2-Button Replica Official MiLB Jersey SALEM VOLCANOES ADULT MiLB 2-BUTTON REPLICA JERSEY MiLB Officially Licensed 50% Polyester/50% Cotton Shirt. Official Minor League Baseball Uniform of Little League, Youth and Adult Baseball and Softball Leagues. Screenprinted with Authentic Toledo Mud Hens Logo/Name. Majestic - Official Minor League Licensed Replica