Gone are the days of those really (not so) cool gym clothes from high school freshman PE class. As iconic and alluring as floppy t-shirts and oversized gym shorts are, they had their time in the sun and moved on. Under Armour replaced them with tough clothing that is designed to keep an athlete cool on hot days and warm on cold days. And Under Armour isn't the same boring t-shirt or shorts offered in the same basic colors and patterns. Athletes can find the perfect clothing for their sport — it will look amazing and be completely functional.