I use Insul-brite between two layers of thin cotton batting. I was told never to use batting that had any poly content as it might melt with the heat. So with the top and bottom fabric, that is 5 layers--they are a little stiff but are holding up well.

I also use Insul-brite between two layers of W&N. After they are washed they are soft. We love them. Don't think I will ever buy another pot-holder as these are so easy to do. BrendaK

I don't like the insul-brite type of batting because it's "noisy" from the silver lining. Also, insul-brite is polyester, so would theoretically melt.

I use 2-3-4 layers of cotton batting, cheapest batting I can find that is 100% cotton (or close), or else scrap batting from projects. Thick pot holder from the store use just cotton, without other fancy materials.

I've done 3 different combos and I like them all - they're good for different purposes.

1. single layer of insul-brite. I like to do this for oversized potholders - great for things that aren't too hot and big enough to be folded in half in a pinch for something hotter.
2. single layer of insul-brite + single layer cotton batting. This seems like a pretty "standard" thickness for potholders and works well for using them as trivets and for most other potholder needs.
3. single layer of insul-brite sandwiched between 2 layers of cotton batting. This makes a puffy potholder that can really take some heat. Kind of a pain to sew together, but great for things that have been under the broiler.

I use Insulbrite sandwiched with flannel then sandwiched with the decorative outside fabric.

I've found that 2 layers of towel keep by hands safe. Batting transfers heat to quickly.

I do the same or use two layers of cotton batting. I also use layers of decorator fabric ( cotton) that has gone way out of style for the insides.

One layer of insul brite + 1 layer of cotton batting makes a wonderful pot holder. I love making pot holders aka kitchen quilts because they are immediately useful and they don't have to be perfect. I make 9 x 9 inch pot holders, use orphan blocks, strip pieced blocks or just plain old squares and bind them by machine. I love 'em because they are useful but not so pretty that those who receive them are hesitant to use them. froggyintexas

I use two layers of insul brite with the shiny sides facing out. Also, the noisy crinkly sound goes away after washing and so does the stiffness. They work great.

I recycle old jeans, using 2 pieces cut from jeans and 1 piece of batting between the jeans. Works great.