Been entertaining out of town friends at beach all week, so haven't been here!
Thanks for the wonderful comments. I use regular warm & natural cotton batting. 12 inch square for center and four 7 inch squares for flaps. To curve the flaps: I take one flap, fold in half, measure 2 inches on each side to start and stop cutting line for curve. Then, use this one as a template for the other 3.
I do put them in the microwave with tortillas and nuke for 30 seconds.