Polyester is a great shirt for sports or during activities because the fabric breathes great when you are working hard, or sweating. It almost feels like silk but a little more like cotton than silk.
You can get some polyester shirts for companies that look really professional as well as nice looking. They do hold prints pretty good but it means we have to use more expensive inks for printing on so it hold the print a lot better. A little more expensive to print on but totally worth it in the long run cause of the quality of the print on polyester.