According to the rules of the game, players must wear the following:
Offensive (At-Bat) Player Equipment
A baseball bat is a long, specially shaped stick made of wood or aluminum.
Its single purpose is to make contact with/hit the ball. One end of the bat is the handle, which is thin enough to wrap your hands around. The handle gradually thickens to eventually become the barrel, which is the part of the bat that makes contact with the ball. In youth, high school, and college teams, aluminum bats are usually used. In professional baseball, only wooden bats are allowed.
Players wear batting gloves on their hands to improve their grip on the bat. Materials on the bat itself also help improve grip. On aluminum bats, players wrap the handle with grip tape, which has a rubbery texture. On wooden bats, players cover the handle with a sticky substance called pine tar.
Offensive players, whether at-bat or running the bases, wear helmets to protect their heads from being hit with a baseball. It is made of plastic with a foam interior, and has an extension (called an earflap) to protect the ear that is facing the pitcher's mound when the player is at-bat.
Defensive (Fielding) Player Equipment
All defensive players use a glove in order to handle and field the ball. A baseball glove is made of leather. Unlike regular gloves, all the finger compartments are attached, and it is shaped to allow the player to catch the ball or hold it in place. The finger compartments are much longer and wider than a player's fingers to allow a player to better secure the ball and to make picking the ball off the ground easier. Certain positions also have a special type of glove. For example, a catcher's glove is much bigger and has more padding than other gloves, as these features allow a catcher to set up a better target for an incoming pitch.
Not only are catchers' gloves different, but catchers also must wear additional equipment to protect themselves from the extremely fast pitches they are constantly receiving. Collectively, the special protective equipment they wear is called catcher's gear. Catcher's gear includes a catcher's helmet; a padded upper body covering; and knee, shin, and foot guards. A catcher's helmet is similar to a batting helmet, but it has metal gridding on the front that allows the entire face to be protected.
Three bases, a pitcher's plate, a home plate, and a baseball are needed to play the game. A baseball is a sphere made of yarn wrapped tightly around a small, round piece of cork or rubber. The sphere is then covered with two pieces of white leather sewn together with red thread. A regulation baseball measures 9 to 9.25 inches in circumference.