. Most energy efficient dog door on the market. High-quality, durable, safe and attractive pet door, door and wall mount styles available in 4 sizes for any dog or cat. DoubleMag seal technology for an airtight, weatherproof seal. Locking interior security panel included. Best-performing energy efficient dog door, lab tests show undetectable air leakage when tested with 25 MPH winds, other leading pet doors tested under the same conditions leaked an astonishing 19 CFM/ft2. Only safe and non-toxic materials are used in the construction of our pet doors. Durable flap materials are marine grade and 10X stronger than leather. Components are rated to withstand temperature extremes from -40 °F to 140 °F (-40 °C to 60 °C) and are UV resistant. Veterinarian and kennel approved. Designed without hinges or springs that can pinch or harm your dog. Pet door itself is made from flexible material to prevent injuries that can occur with rigid materials. Only pet door to meet California title 24 energy efficiency requirements. Replacement parts available. Pet training tips provided.