A Baseball and Softball training glove or mitt is used to help ballplayers hone their fielding, catching, throwing, receiving, and transfer skillsets. Most of these gloves are either smaller than your normal sized glove, heavier, or flat.  Most of these gloves come in the following types of models: 

• Pancake Training Gloves A pancake training glove is one that is built with a flattened catching surface.  They're also now made with more freedom in their hand now for a middle ground. Training with a pancake glove reinforces two hand mechanics while fielding a ground ball as a fielder is forced to use their throwing hand to stabilize the baseball or softball during the fielding process. 
• Undersized Training Gloves Undersized training gloves and catcher's mitts are ones built at short lengths and circumferences, but with fittings that work for adolescent-to-adult-aged players. Due to these gloves and mitts being small in their sizing, they require the fielder to be extra focused during training. After using an undersized trainer and then switching back to your regular gamer glove, you'll be surprised by how much easier it is to field a ball with your regular model.
• Weighted Training Gloves & Mitts Weighted Baseball & Softball gloves and mitts can help a player train as they limit the player's deftness with their glove while catching or fielding a ball. There will often be times when the glove is not only heavier but also smaller than an average glove. These multiple constraints will require a player to be more focused during training and become a better player when they receive their regular regular gloves back on their hands.