The revolutionary flap design is made of individual, interlocking segments that create an airtight seal with magnets to keep extreme weather out while providing your house with energy efficiency.. Armor Flex Airtight Extreme Weather Magnetic Closure System Pet Door is finished with the toughest industrial powder coat for the perfect blend of look and functionality. It features heavy-duty aluminum frame construction, high strength ABS composite flap construction and all stainless-steel hardware to ensure the safety of your paw-tner and protection of your home.