Steel-Craft Classic Steel, along with Wayne-Dalton 8300 / 8500 is one of our best doors. Both are built with a steel exterior and interior with foam injected polyurethane insulation. These doors can stand up to a beating, your children could kick a soccer ball at it and it would not dent like non-insulated options. You will not believe the temperature change in your garage when one of these doors is installed, you can feel the difference.