Polyester had its first heyday in the ‘70s... “Think” knitted tracksuits from the ‘70s, when it became the notorious fabric that gave the polyester the reputation that it in many ways, still has today: a non-breathable material.
But today polyester is very different. It is a fiber that has been developed and refined as well as supplemented with properties that you don’t get in other materials. Polyester is a man-made fiber that can be developed and manipulated just as we want it... Therefore, it is also the most widely used fiber for high performance clothing today.