I would be careful with potholders, because they are the only thing between you and a hot pan and a potential 3rd degree burn. I was given some potholders made by a group of Down's syndrome patients, and they were heavily quilted with what turned out to be polyester thread. I was taking a hot iron casserole type dish out of the oven, and the polyester thread melted and I ended up with burns on both hands (from two potholders). They weren't serious burns, but they were very uncomfortable.
Polyester thread can melt. The cheaper the thread, it seems, the more likely it is to melt (I did some experiments after my experience). I also worked with the group of Down's Syndrome women in their workshop, and showed them how polyester can melt. I also suggested they start using that thermal batting that insulates so well (Thermal Brite???) Eventually, all they made were 100% cotton potholders, and advertised them as "safe at higher temperatures", so they actually ended up selling more potholders. The local university provided the "expert scientific testing" that backed up the safety of the potholders. It seems that a lot of people have concerns over safe potholders! Good story, isn't it!