90% Airlume combed and ring-spun cotton, 10% polyester(athletic heather) and 52% Airlume combed and ring-spun cotton, 48% polyester all other colors. It's a home run. The iconic baseball ¾ sleeve tee just made it to the big leagues with the game-changing softness of 1x1 micro rib, a silhouette-flattering fit, and a versatile mid-length hem. This must-have style features the classic contrast raglan sleeves and crewneck binding making it the star player in closets everywhere.