JoAnn's has it, but it's best to ask them where they keep it. It varies from store to store I've learned.

I would use it if I was going to use the potholder.

I make potholders quite often. I like to use an old cotton mattress pad which is thick and firm. If you use polyester, the heat will come right through. I make two rectangles, sew them together leaving an opening. Turn them right side out. Press flat. Cut a piece of pad to fit just inside the potholder. Insert it and flatten to corners. stitch opening closed. Stitch an "x" from corner to corner. This is the first machine sewn project I did as a 4H project almost 70 years ago. I do use insulbrite for my micro-mitts. They are an oval shape and have little finger pockets on one side at each end. I use insulbrite for these as it is thinner. Most of my microwave dishes are plastic or ironware and do not get extremely hot.

IMHO and experience my potholders made with insulbrite work better than my potholders made on the form with the points that you stretch cotton jersey on and weave together. Those woven ones are over 1/4 inch thick and the heat still transfers. Just a matter of preference I guess, but I find the hype is true.

Here is a link for the silver cloth:
http://www.fabric.com/ProductDetail....Fap7Qgodpl8AwA