What is the difference between a first base mitt and fielders glove?

A first baseman's glove is larger and it has more padding that a fielder's glove. This is to get the most reach possible to catch wild throws. The padding is because the fielders are throwing the ball as hard as they can so that they can get the ball to first base before the batter reaches the base.

Note: Gloves are used by for Fielders - Pitchers, Infielders, Outfielders because they have fingers like a glove. Mitts are used by Catchers and First Baseman positions because they don't have fingers, like mittens.

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