As noted in other reviews, the shirt is extremely slim fit. I am 5-10, 190 lb and pretty muscular. I was able to get into the 4X but it would have been a little uncomfortable for me all night.

If you are working out, it will look very good on your chest. I think I would have kept it had the arms been a little bit bigger and the shirt have been a little bit longer. The color is also more muted than the pictures.

The shirt is fairly short for a person who is about average height, such as myself. I did end up sending it back only because I found a slightly better option.