I use insulbright - I found some at Joann's and used a 50% off coupon - so it was $ 3. something a yard. you can get alot of potholders out of a yard. Anyway, I test my potholders and this stuff really works - I have purchased home made pot holders in the past and have received them as gifts - but they burn your hands - so use this and you will have no problems.

I have used both warm/natural 80-20 or 100% cotton (which really isn't 100%, have some poly in it); there is another called Insulbrite - works great.

Me too, and insulbrite sandwich...