That shirt in the picture is 65%poly and 35%cotton, and it was soaking wet after the job. It did dry faster than my cottony golf shirtsAre your shirts 50/50 or all cotton? Cotton will stay wet for hours. Get you some Dickies work pants that are 65% polyester too.
For some reason I always thought you looked like the little guy in your avatar.
Yep you can be drenched in sweat underneath and it wicks away quickly and keeps the air flow going through very nicely. I wore mine in Nashville in 2015 at Mikeyfest. It was in the 90's and felt like 100% humidity. Standing outside during the demos my head was sweaty by my shirt stayed dry and you couldn't tell.The shirts really do work/help. Used them for years.