I have asked similar question here on the board because I have so many scraps of batting. Poly was a no-no because it does not work well with heat. I was told to sandwich insulbright in between two layest of cotton batting (cotton batting - insulbright - cotton batting). I made a few and I am not really sure I like insulbright at all. It makes my potholders so stiff. They may be good for under the pots, but not for handling pots on the stove. That is just me. I think I will try advice I got here on the board about using old towels sandwiched between cotton batting. Trial and error!