A carrier sheet or carrier mask is the original polyester backing on HTV. It’s what makes one side of the material appear glossy. This side of the material always goes face down when cutting and should not be cut through during the cutting process. The carrier keeps the HTV design in position so you can place it on a garment and heat apply. There are two types of carriers: pressure sensitive and static. Most Siser products (like the #1 selling EasyWeed!) have a pressure sensitive or sticky carrier while some have a non-pressure sensitive or static carrier.