Under Armour Alcoa 2-Button Baseball Jersey Maroon White #4 Medium Under Armour baseball jersey for Alcoa. Maroon with white side panels and white piping along the raglan sleeve seams. ALCOA in white block letters on the chest. Number 4 on the back. Two-button henley neckline, short sleeves, mesh performance fabric. Under Armour jock tag on the lower front left hem. Tagged medium. No defects, no wear.