This shirt is the best for hard working men.  I'm a machinist, welder, and fabricator, and I need something that doesn't tear or come untucked during the workday.  Like other reviewers have said, the sizing is quite generous, I wear a medium when I would normally wear a large regular tee shirt.  The extra length tucks well into pants and doesn't bunch up.  The pocket is deep and on the left side, where it doesn't interfere.