The great thing about PlexiDor Pet Doors, is that they do not require costly vinyl replacement flaps. They feature unique shatter resistant dual-thermo pane Plexiglass panels, which open and close with a gentle push and automatically close securely without banging. Both panels are lined around all four edges with snug fitting, high density, industrial nylon pile weather seal to provide the best draft control available. When the door is closed, the panels reduce air conditioning and heat loss. So, no matter if you live in a hot desert climate or in the frigid cold, this PlexiDor will save you money year-round. Your dog will love the smooth, quiet and safe door and you'll appreciate having a lower energy bill.PlexiDor Performance Pet Doors Maximum