Details:
60/40 Cotton - Poly Blend
This is a Fitted Style as opposed to a Boxy fit. 
 
Size Chart:
Small - Length 28 Chest (armpit to armpit) 19
Medium - Length 29 Chest (armpit to armpit) 20.5
Large - Length 30 Chest (armpit to armpit) 22
XLarge – Length 31 Chest (armpit to armpit) 24
2XLarge – Length 32 Chest (armpit to armpit) 26
3XLarge – Length 33 Chest (armpit to armpit) 28