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This cat flap that is insulated comes with a double-flap mechanism and offers a good level of protection for different climates. It is available in wood, uPVC, glass, and steel doors. It is essential to have a door that can be sealed tightly, particularly during cold weather. It prevents warm air from being sucked out and cold air from getting in which can save money on energy costs. Wind Resistance By preventing cold air from entering your home and allowing warm air inside, a cat flap cover will keep it warmer.