The NEW Twin Draft Guard Ultimate is 50 percent bigger. This double-sided insulator saves energy and money! The Twin Draft Guard Ultimate fits doors and window up to 36 inch. It moves with the door! No bending to reposition! Made from durable microfleece water repellent fabric. The Twin Draft Guard Ultimate makes heating and cooling efficient by blocking drafts from both sides of the door and window. It easily glides over all floors: carpet, wood, tile and linoleum!