first basemen's glove

RulesMLB Umpire Manual

First Baseman’s Mitt

Rule 3.05: The first baseman is not permitted to use a first baseman’s mitt if, in the umpire’s judgment, another fielder is positioned at first base. If the umpire determines on his own or after being prompted by the opposing manager that the first baseman is not positioned at first base, the umpire should instruct…

RulesMLB Umpire Manual

Procedures For Measuring Fielding Gloves

Rules 3.04, 3.05, 3.06: Official Baseball Rules 3.04, 3.05, and 3.06 describe proper glove measurements and should be enforced for all gloves used in Major League games. The key measurements are “J” and “A” lines (see Diagram Number 4 in the Official Baseball Rules). The “J” line from the top of the index finger (first…


3.05 First Baseman’s Glove

The first baseman may wear a leather glove or mitt not more than thirteen inches long from top to bottom and not more than eight inches wide across the palm, measured from the base of the thumb crotch to the outer edge of the mitt. The space between the thumb section and the finger section of the mitt shall…

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