Louisville Slugger 125 Series First Base Mitt (12.75-Inch) Genuine steerhide leather for strength and durability Oil-treated leather for a great feel and easier break-in Slugger Touch finger linings wick away perspiration from the player's hand for control and comfort Dye-through lacing for extra durability 13" Professional first base pattern features a closed back with finger hole and a single post double bar open web.