I do not offer returns or refunds based on incorrect sizes (or if you feel like too much of a geek around your non-AI friends with the shirt on), however, if there is a quality issue and you contact me within 14 days I can get you a free replacement or refund. Please take a good photograph of the flawed area. If you have specific questions about a product or sizing, or received a product and have an issue, please contact me below. I will get back to you as soon as possible. Keep in mind that I am not a big company or anything, just some artist dude who made some shirts.