Torchflex are made from a tough non-woven mat (fiberglass, reinforced polyester or composite) and coated top and bottom with SBS polymers and premium asphalt. SBS (or Styrene-Butadiene-Styrene) is a rubber-based chemical that gives the asphalt some outstanding qualities: superior elasticity, excellent moisture resistance, and exceptional cold weather flexibility. The end result is a long-lasting, durable membrane which can be applied to a wide variety of surfaces on roofs of almost any shape or design. It provides superior protection against water infiltration and extreme weather conditions. Torchflex cap sheets are offered with ceramic coated mineral granules embedded into the top surface for greater resistance to damaging ultraviolet rays.