See the line drawing for this product The 34 wide leading edge is a hard PVC material bonded to the 134 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 134 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