This Energy Saving Extreme Weather Pet Door utilizes a triple-flap design to ensure a weather-tight seal creating a pet door that is 3 1/2 times more energy efficient than any single-flap pet door and still allowing your pet the freedom to come and go. The new Petsafe design is for areas where the weather is ""extreme,"" thus sealing out the heat and the cold during those climatic times of the year. Three Sizes: Small, Medium and Large. This product is covered by our Limited Lifetime Warranty from PetSafe. 3-Flap system offers protection from extreme heat, cold, drafts, insects, or driving rain. Maximum energy efficiency is 3.5 times higher than our single-flap pet doors. Color: White. Snap-on weather cover for added insulation. Fits door thickness 1-1/2"" to 2"". Durable plastic frame.