The High Tech Pet Armor Flex Pet Door is like no other cat door on Earth. This ingenious new dog door features a revolutionary, patent pending flap design that creates an airtight seal, providing the highest level of extreme weather resistance and energy efficiency. The innovative new flap design is made of individual, interlocking segments, each precisely positioned by rare earth magnets. The interlocking segments pivot relative to one another to provide the horizontal rigidity required to create an airtight seal while providing vertical flexibility, making it easy and safe for your pet to use. Compared to the next best pet doors on the market, new Armor Flex doors represent a big step forward in quality, innovation and technology with lower pricing to give you, not just the best pet door but, the best VALUE anywhere. Check out our door mount, wall mount and our ultra-high quality, double glass, Low-E patio door mount models.