Heritage Proline Titan XT™ Shingles have a fiberGlass mat construction with a random-cut sawtooth design. Two layers of fiberGlass mat are coated with Asphalt, surfaced with mineral granules and then laminated together. The Shingles feature a self-sealing strip of Asphalt and a reinforcing strip of polyester fabric on the back of the Shingle, attached in the common bond area to provide added anchoring for the expanded nail zone.