See the line drawing for this product. The 3/4″ wide leading edge is a hard PVC material bonded to the 1-3/4″ flexible vinyl material There is great potential for heat / cooling loss at the top of any garage door. This product is a very good option in combating this. Installed on the top of the door: The hard PVC portion of the seal is attached to the top of the door, as the door closes, the 1-3/4″ vinyl seal bends back making contact with the header of the structure. This results in a very good seal and is typically used in conjunction with side seals mounted on the outside., Manufacturer: Garage Door Stuff