Medium Petsafe Guardian Series Plastic Cat & Dog Pet Door has a snap-on closing panel to use during those times when you do not want your pet to use the pet door or during inclement weather. The soft, flexible tinted flap is safe and easy for your dog to push open so he can let himself out - and back in. For better weather insulation, the magnetic strip at the bottom of the flap keeps the flap closed when your pet's not using the door.