AIRism is a quick drying polyester spandex blend that makes for a great workout tee shirt. It looks good- kinda shiny, and it drys very quickly when you’re working out. Overall, our favorite work out tee, and we’ve tried a lot. And it’s cheap, like everything from Uniqlo. Just make sure you’re ordering the right one – you have to really go out of your way on their web site to figure out what you want among their vast array of products.