That's what my dad says too. To each his own. I find the quick dry fabrics so much more comfortable in the hot sun. They don't get soaked with sweat, they protect against UV rays, and they dry really fast. Cotton for sure when the day is done or it's not too hot. But I've taken to wearing the sunblock shirts whenever I'm out in the summer during the heat of the day.polyester makes me sweat more
And here's a money saving tip: you don't need to spend $50-$75 for one of those nifty Columbia long sleeve fishing shirts. You can find the Little Donkey Andy version of that shirt for about half of the price of the Columbia. I've owned both. No practical difference between the two. And Little Donkey Andy is just a better name.