Just as some have already mentioned, I use whatever is on hand and works for the purpose. Old towels, old matress pad, duck fabric, ironing board covers or pads, warm and natural, etc....but my favorite is army blankets. I buy them from a sporting good place and wash them first. Then I cut them like any yard goods to make hunting jackets, candle mats, pot holders, table mats, pet beds, ironing board covers, etc. They are 100% wool but made to last and last and can easily be washed in cool water and dried in dryer. I do it all the time. Sometimes they come in green, sometimes gray, but sandwiched that color does not show.