Sublimation is the process in which a special ink is used to print the design and pressed onto a substrate that is either coated with a special coating or material that is 100% polyester. If pressing onto a shirt that isn't 100% polyester the design will have a duller look to it and will wash out some after each wash. Sublimation ink can only stick to polyester fibers which is the reason for the less vibrant image and the washing out a bit after a wash. It is suggested to press at 385 degrees with light pressure for approximately 45 seconds. Ensure you adhere the paper to the substrate to prevent ghosting which is caused when the paper lifts or moves during the transfer process. It is best to rip around the image to remove any excess areas to prevent unseen ink from transferring onto your garment. Transfers will come printed reverse.