This CRL Pile Weatherstrip maximizes the energy efficient qualities of fiber pile by adding a dual barrier. The weatherstrip minimizes air and dust from infiltrating the center of doors that use our Adjustable Astragal. The polypropylene black fiber pile resists corrosion, and has exceptional resistance to abrasion. It is silicone treated to repel water, and stabilized against ultraviolet and ozone. This Weatherstrip is installed by simply sliding it into the pile channel of the existing CRL Adjustable Astragal.