A nice touch for men is the interior pocket label that lays flat.
Main Street of America Route 66 Hot Rod Long Sleeve T-Shirt
If you are between sizes, the small runs slightly smaller than average.
Get In Loser UFO Alien Funny Joke Humor Humorous T-Shirt
You will notice the small size allows full arm movement without pulling.
250 Years of American Independence Day US Flag 4th of July Patriotic Long Sleeve
You will notice the small size has a narrower chest panel for a snug feel.
In Guns We Trust 2nd Amendment Veteran Military Patriotic US Flag T-shirt
You will notice the small size keeps the shirt from looking oversized.