I know I have posted a thread about potholders somewhere before. I have only made one or two sets awhile back. So I don't remember if you are to use 2 pieces of insulbrite and 1 piece of cotton batting plus fabric for one potholder. I was thinking of 2 pieces of insulbrite so that no matter what side you use it would protect from the heat. Or does it not make a difference? And also to make potholders, is it nessesary to prewash?