Not all metallic looking objects have issues in the microwave. I have a couple of coffee cups that have no issue; the coffee heats up and the handle stays cool. Do the test; make sure there is moisture in the microwave when doing it. Since you'll be using it with a potato; then I'd let that be the moisture part; if you use a cup of water which will be more moisture than you would have with a potato then you might get different results. The fabric is great.