For the longest-lasting shirts, we recommend you machine wash them in cold water, inside out, and hang them to dry. If you're a renegade (or lazy and bad at planning ahead, like us), you can throw them in the dryer, but they will shrink a bit. It's what cotton does, even preshrunk cotton. Here's a directive you'll like: don't ever iron your shirt. If you have to iron it, avoid the design.