Most shirts don't do anything more than cover your body. Some of the good ones keep you cool and dry. Apart from doing all that, Radiate Athletics also makes shirts that changes color as your body heats up when you workout. It's like thermal vision built into the shirt, which is a cool effect. And many people seem to think so. The company tried to raise $30,000 on Kickstarter to get the shirt to the masses but ended up raising close to $600,000.