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There are two types of material that you can pick form. The first is polyurethane which is foam that is sprayed between the exterior and interior panels of the Roll up Garage Door. The spray is a result of blending two chemicals which react by becoming bonding foam that expands and fills up every air gap. This method is thorough and hardens into a rigid strong material that stops cold air from creeping in and stops high energy bills from getting higher. The second material is polystyrene which resemblances packing material and is cheap but less effective. Since the material is a solid it is glued into place between panels, leaving plenty of air gaps for air to escape out.