PetSafe Extreme Weather Pet Door for Cats and Dogs – 3-Flaps for Added Insulation – Medium Pets Price: $98.95 (as of 04/09/2023 20:55 PST- Details) & FREE Shipping.

ENERGY EFFICIENT: Unique three-flap system is rated 3.5 times more energy efficient than single flap doors
CENTER INSULATED FLAP: Perfect for hot and cold climates; keeps the warm and cool air inside your home. Fits doors 1.625 – 2.25 inches thick
CONTROLLED ACCESS: Snap-on closing panel allows you to keep your pet from using the pet door; use a second closing panel (sold separately) on the outside for an additional layer of weather protection