Hmm. the listings I found said: "This 100% cotton fabric with resin finish is also great for quilt backing" further searches found: "Crease-Resist finish or "wash-and-wear" or "wrinkle-free" finishes are achieved by the addition of a chemical resin finish that makes the fiber take on a quality similar to that of synthetic fibers."
I guess I would purchase the smallest amount possible, launder it then decide.