Marucci Krewe M Type 37S1 12.50" Baseball First Base MittMarucci Krewe M Type 37S1 12. 50" Baseball First Base Mitt M Type fit system provides integrated thumb and pinky sleeves with enhanced thumb stall cushioning to maximize comfort and feel. Fit: Tapered Shape: Standard Depth: Deep Smooth cowhide leather shell Supple leather palm lining with added cushioning Narrow tapered hand stall sizing for ideal fit Smooth microfiber wrist lining and finger lining Available in right hand throw or left hand throw