I tried those polyester shirts and hated them. They absorb nothing and it feels like you're in running water, only it is sweat.
Pretty much like an olefin carpet. It does not breathe. It just doesn't hold any moisture.
With these Poly shirts you'll can actually feel (and personally track) each and every individual drop of sweat as it finds its way all the way down to the bottom of your shoes.
Give me cotton any day. Just take a few of them with you.
P.S. And that is from somebody, unlike Art or Chavezico, that actually cleans for a living.
Willy's way is also rock solid, as Mardie who was practically raised by Willy, can attest. And see what happened to him.