Breaking in a new catcher's mitt is essential to ensure a comfortable fit and optimal performance. It involves gradually shaping the mitt to conform to your hand and preferences. Here are some tips:nn1. Apply conditioner or oil to soften the leather.n2. Use a mallet or glove pounder to gently break in the pocket and loosen the leather fibers.n3. Play catch with the mitt, gradually increasing the force of the throws.n4. Use the mitt during practice sessions to speed up the break-in process.n5. Repeat the conditioning and shaping steps as needed until the mitt feels comfortable.