Pro Select combines Mizuno's rich glove heritage with advanced glove scans of hundreds of professionals to create pocket designs tailored specifically to each position and how players prefer to break-in their glove. US Steerhide Leather: Premium US Steerhide is firm and built to hold up to the rigors of a full season. Comfortable, hand based patterns: Sets your pocket under the web and helps to shape your glove like a pro. Player Pocket Designs: Pockets tailored specifically to the player's needs and how they prefer to break-in their glove. Recommendations:Shallow: Middle Infielders. Regular: All. Deep: Shortstops and 3B. Steersoft Elite Palm Liner: Elite Leather palm liner provides exceptional feel. Thumb slot: Provides additional comfort and a solid, secure fit.