Legacy 975 Insul Fleece is made from polyester fibers which are needle punched with an aluminized scrim binder that helps to reflect heat or cold back to its source. It is soft and comfortable for use in clothing as well as home decor and accessories projects. Insul Fleece can be sewn through and once sewn is machine washable and dryable. Keeps hot things hot longer and cold things cold longer. Insul Fleece is not heat proof or fire resistant. We suggest you use an extra layer or two of cotton batting such as Natures Touch 100% Cotton between the outer fabric and Insul Fleece for pot holders or heat resistant pads. Use caution when handling any hot surfaces. Do not iron directly on the aluminized scrim binder.