PetSafe Extreme Weather Energy Efficient Aluminium Pet Door for Cats and Dogs, Insulated Flap System, Medium (M)MOST ENERGY EFFICIENT: Our unique 3 flap system protects your home in hot or cold climates; adjustable, flexible flaps have a magnetic seal for added protection ADDITIONAL INSULATION: The centre insulated flap helps keep extreme warm and cool air outside of your home BUILT TO LAST: The durable metal frame with its reinforced aluminium corners is built to handle active and multi pet households CONTROLLED PET ACCESS: Use the slide in closing panel to