Our steel garage door 390 Series features a standard panel design with an embossed wood grain texture to enhance the appearance and durability of your door. The polystyrene insulation provides a 9.8 R-value for enhanced thermal efficiency of your garage space. A steel interior backing of the door provides a durable, finished appearance. Model 391 steel garage doors come with a limited lifetime warranty which means they are built to last. A wide variety of window options are also available for these steel garage doors.