I've never understood how polyester become the defacto choice of fitness/sports/performance clothing. I'm guessing its cheaper to manufacture, but they can still get very expensive.

I made the mistake of buying a bunch of this stuff a while back and I can't bring myself to wear it. I feel like it makes me sweat far more and it stinks very quickly.

I have far less of a problem wearing cotton and and a great experience wearing merino wool.