New 2013 Baseball/Softball Mizuno Short Sleeve G4 Premier Batting Windbreaker Athletic Sports Jersey/Jacket New 2013 Mizuno Baseball/Softball Premier Short Sleeve G4 Batting Windbreaker Jacket/Jersey. 100% Polyester shell and rib. D.FCUT designed specifically for baseball motion. High density for wind resistance. Locking Zipper. Half Mesh Back. 3 Youth & 6 Adult Sizes, 4 Colors (Black, Navy, Red, Royal)