Why do ball players wear one sleeve?

Why do ball players wear one sleeve? Oftentimes, a player might only wear one long sleeve if they are trying to keep their arm warm and loose as a pitcher or a player that is relying on making strong, fast throws that day. In order to prevent injury, you will see pitchers work hard to stay warm and loose between innings and while on the field.

Oftentimes, a player might only wear one long sleeve if they are trying to keep their arm warm and loose as a pitcher or a player that is relying on making strong, fast throws that day. In order to prevent injury, you will see pitchers work hard to stay warm and loose between innings and while on the field.