A sublimation polyester promotional t-shirt is a type of t-shirt made from polyester fabric that has been treated with a sublimation printing process. Sublimation printing uses heat and pressure to transfer ink onto the fabric, creating a permanent and vibrant design. This process allows for complex and full-color designs to be printed onto the t-shirt. Polyester fabric is often chosen for sublimation printing because it has a high resistance to fading and shrinkage, and it is also lightweight and breathable, making it a comfortable option for activewear or casual wear. Sublimation polyester promotional t-shirts are commonly used for corporate events, sports teams, or as a marketing tool for businesses.