INSUL-BRIGHT, is a needle punched, insulating material that is ideal for home sewers and crafters. Create projects like pot holders, oven mitts, and casserole covers. Hollow, polyester fibers needle punched breathable and won't break down with washing. This reflective material resists resists radiant energy. The energy, hot or cold, is radiant energy, reflecting the hot or cold back to its source. Won't break down with washing.