The shirt is often made from lightweight, breathable fabric like polyester or a polyester-cotton blend. It usually features the team’s colors, logo, and sometimes the player’s name and number on the back. Baseball jerseys are often short-sleeved and have a button-down or pullover style, with contrasting sleeves or piping to add visual appeal. The shirt is often made from lightweight, breathable fabric like polyester or a polyester-cotton blend. It usually features the team’s colors, logo, and sometimes the player’s name and number on the back. Baseball jerseys are often short-sleeved and have a button-down or pullover style, with contrasting sleeves or piping to add visual appeal.