I only use the most professional vinyl flex there is so the design won't crack peel or fall off. I mainly use the fruit of the loom or gildan t-shirts, they are both trusted brands that have been around for years. When choosing a size for your t-shirt, I would always go a size up. I am very easy to work, I can make kids t-shirts please feel free to get in touch. Or if you see a t-shirt that you like, but want it in a different color that I do not please do not be afraid to ask.Thank you for your time.