Our steel garage door Model 399 features a long 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 399 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.