Wrinkle-Free is a term used to described an item of Clothing that is not wrinkled even with washing so it does not require an ironing.
It is a term used in textile mabufacturing that refers to the basic process for imparting the wrinkle free finish into fabric involves applying a resin into the fabric, drying and curing at extremely high temperatures to the desired dimension, scouring to remove any residual chemicals, and final drying. The application and curing of wrinkle-free may occur before or after the garments are produced. "Precured wrinkle-free" means that the finish has been applied to the fabric before the garment has been manufactured. Because the "postcure wrinkle-free" means that the finish has been applied after the garment has been manufactured and because the "postcure wrinkle-free" process is set into the final, pressed garment, it is more popular.