Basically, I asked for fleece at fabric land and we couldn't find anything right then, she said 'wait do you mean speaker box fabric?' and I immediately thought she would bring me to the gray carpet but she brought me to white fabric that is stretchy in all directions labeled 'speaker box fabric' or something. It should be polyester whatever you use because resin is poly based.
looks like speaker grill material ,fleece is a lil different ,dont absorb as well cause its thicker ,i use micro fleece ,its fleece just thinner ,but almost any absorbing and stretchy material will work