Athletes have known for years that clothing made from blended polyester is more breathable — and therefore more comfortable — than cotton. The GloWear 8289 Class-2 Economy T-Shirt is made from a 3.3-ounce polyester fabric that the maker says wicks moisture to keep the wearer dry all day long. It comes in high-visibility colors with 2-inch-wide ANSI-certified reflective accents and costs about $13. Ergodyne, 800/225-8238, ergodyne.com.