The PetSafe Extreme Weather Pet Door allows your dog or cat complete freedom to go in or out without opening your home to extreme weather conditions. The 3-flap system offers protection from extreme heat, cold, wind, insects, snow, and driving rain. It’s 3.5 times more energy-efficient than standard single-flap pet doors. Perfect if you live in an area with extreme climate. The snap-on weather cover provides extra insulation. Flexible flaps are safe and easy for your pet to push through. Fits standard doors 1.5 to 2 inches thick. For pets up to 15 pounds. Measures 7.6 x 11.1 inches. Complete assembly instructions included.