PROBLEM I have was simple, avoidable, but simple.

Received the incorrect size. Product size I ordered was listed properly on the outside of the package. The ACTUAL size of the shirts was one size SMALLER than what the package listed though. I saw all the markings were what I ordered and needed, but I put it aside because I didn't need them at the moment. When the time came, months later, way outside the return window, I found them to be mismatched with the packaging.  They also had been turned around in the package, which is another reason I hadn't noticed it when I received them.

THE REASON FOR THIS REVIEW
To warn you not to make the mistake I made. GREAT PRODUCT, JUST VERIFY THE SIZE OF THE ACTUAL PRODUCT when it arrives. NEVER ASSUME IT IS CORRECTLY MARKED ON THE OUTSIDE...OR THAT THE ACTUAL PRODUCT IS CORRECT, BUT THE PACKAGING IS MARKED DIFFERENT.
Aside from that, I love these shirts. TOP QUALITY!