As created by the children and wife of Robert Downey Jr.

The classic baseball tee receives a fresh update, thanks to a super soft material blend. With the fine print, this long sleeve is a perfect fit for every active person. 
.: Modern fit
.: 52% Soft cotton; 48% Polyester (fiber content may vary for different colors)
.: Extra Light Fabric (3.6 oz/yd² (122 g/m²))
.: Tear away label
.: Runs smaller than usual