I am between medium and large, but mostly order medium. Based on reviews saying this ran small i went with large. Probably could have gotten my normal size of medium. Listen to the reviews when they say to order your normal size!!  Its a tad large but i still like it. Will wear it with leggings.  Thicker than i thought it would be so probably more of a fall to winter shirt. I do like it alot and is very comfortable.  Will be ordering more colors! 5'6, 140.