Potholder materials: 100% cotton with cotton batting and special needle punched batting with metal fibers to make it even more safe to use! These potholders can be washed and dried with ease, but do NOT use them in the microwave. The metal fibers will possibly cause damage to your microwave. These potholders are stitched to last, the edging is double stitched to ensure long lasting life and to endure washings and daily use. That raggy fray will have even more character after each wash!