Creating a proper garage door seals with our garage door products is the first step to make your door more energy efficient, in addition to helping keep out driven rain, excess water, pest, dust and pollen. A garage door threshold creates a seal that blocks out the elements by closing the gap between the door and the floor. The tight seal keeps the inside of your garage sealed against the outside weather. Our garage door threshold kits are easy to install, and come complete with threshold, adhesive, and instructions. Garage Door Bottom Seal Material. We custom cut the garage door seal material to the size you need.