Sublimation printing is the process of transfering an image onto an object using fabric dye.
First the desing is printed onto paper specifically for sublimation printing. Then the design on the paper is heated enough to turn the ink into gas. It's pressed against the fabric in it's gas state and the ink permanently transfers onto the fabric.
Finally they sew the flat pieces of fabric together to create the garment.
Sublimation is a growing style of work and sports team uniform!