A great knock-around staple, the American Baseball Tee. We only wish we had these in Steve Cass' favorite team colors: orange and white!  
Depending on the color, these shirts can be a blend of cotton, polyester, and rayon. The collar is ribbed knitting for improved durability. The sides have seams to provide structural support.
.: 52% airlume combed and ring-spun cotton, 48% polyester (fiber content may vary for different colors)
.: Extra light fabric (3.6 oz/yd² (122 g/m²))
.: Modern fit
.: Runs smaller than usual