It is used for making pot holders, oven mitts, hot cold insulated reusable grocery bags, teapot covers, and ironing board covers in addition to many other items that require some variety of insulation. Insul bright is heat resistant and is made of a combination of polyester fibers and mylar. It is a lightweight fabric and is terribly flexible, so that you would be able to use it in a couple of various sewing projects. Mylar is a brand that makes a polyester paper like fabric it really is magnificent at insulating in both cold and hot environments. Mylar acts to insulate against hot temperatures to keep you from getting burnt, and it also can help to maintain your food warm. Have you ever ordered start food on your door?Chances are if you have, your food was probably transported in a bag made from insul bright, or the same insulating material, to keep it nice and hot while it was making its way to you.