Steel + Vinyl backed styrafoam insulation (R Value 5.3). Double layer steel doors are built with low-maintenance, heavy-duty steel and feature a vinyl-coated insulation.  

Experience the strength, security, and piece of mind you get with steel.

	Double-Layer: Steel + Insulation A double-layer door provides durable, low maintenance features, plus a layer of vinyl-coated insulation for increased thermal properties and quieter operation. Heavy-Duty Exterior Steel Durable, Reliable, Low Maintenance Environmentally Safe Polystyrene Thermal Insulation with Vinyl Backing Energy Efficient Quiet Operation