TorchTape 180-FF Roof Tapes are constructed with a tough non-woven reinforced polyester mat strengthened with select glass fiber strands. They are coated with select SBS polymers and premium asphalt, to offer superior elasticity, excellent moisture resistance and exceptional cold weather flexibility. TorchTape 180-FF Roof Tapes are available in both 168 mm (6.6 in) and 335 mm (13.2 in) widths. Both surfaces of the product are covered with a thin micro-perforated film, which dissolves during heat welding to the substrate.