Mizuno GXF57 MVP Baseball First Base Mitt (Copper, 13.00-Inch) (Left Handed Throw) 88.95 Mizuno The Mizuno GXF57 is a 13.00-Inch Pro sized first basemen's mitt made from soft Bio Throwback leather and is game ready right away. Since 1906 the Mizuno glove masters that design Mizuno Baseball Gloves have continued to discover innovative materials and technologies that enrich the baseball and softball experience. Mizuno combines the finest materials in the world with hand craftsmanship and revolutionary designs, providing baseball players with a competitive advantage, and helping baseball players of all abilities perform at their very best on the field. High performance catcher's mitts for the fastpitch athlete featuring innovative technologies like Power Lock for the most secure fit available and ParaShock palm pad for shock absorption. ParaShock - Three finger Channels that customize the fit to your hand. 13 Inch Full Sized.