Hello! I am heat pressing a low temp transfer (305 degree) onto a self wicking shirt. The problem I am running into is that the shirt color changes when heat is applied. It darkens. I know the shirt is the issue, not the process. I can see the heater marks on the shirt, even on light colors. I've used cover sheets ect. with no success. Does anyone know of a GOOD shirt company that can provide me with shirts that are high quality, self wicking, and offers lots of color choices? Thanks for your help folks!