Best energy efficient seal on a dog door ever!

Best dog door I have ever had! I have had dog doors for many generations of golden retrievers, and they have all been terrible at keeping an energy tight seal. I used be able to feel outside air (cold in winter and hot in summer) leaking into my house. This door flap keeps a nice firm seal. It took my more timid dog a few tries to figure out she needed to “push” the flap a little more than the old flimsy flap to get in and out, but a few tries with cookie rewards and she had the hang of it!! I highly recommend this product.