Why Polyester Deserves a Closer Look Polyester is everywhere. In leggings, sports bras, base layers, running tops, gym shorts, jackets, socks, underwear, even bedding and everyday clothing. It is the single most dominant fibre in modern sportswear and for many people, it is the fabric touching their skin more than anything else they own. already introduces this reality. “Polyester is a petroleum derived plastic known as polyethylene terephthalate.” This spoke expands that foundation into a full, evidence aligned deep dive. We explore – What polyester is – How it is made – Why it dominates activewear – What research says about textile chemicals – How polyester behaves on…