The CHAMPRO Ace Half-Sleeve Baseball Jersey is made of 100% polyester for both comfort and durability, with a loose fit for extra comfort. Set-in sleeves along with a button-down front give a classic look. Sleeves are double-needle hemmed for durability. The six buttons are carefully spaced to allow room for lettering across the chest, making it easy to customize with a team name. The shirt-tail bottom opening gives a breezy feel and lets athletes move easily. Available in adult sizes S-4XL in five color combinations.