For higher-impact situations where fabric is used, Spunflex II’s 100% knit polyester fabric, which is embedded into Benchmark®, Rapid Roof III®, and Rapid Roof® HV, provides exceptional tensile and tear strength. SpunFlext II special reinforcement fabric substantially increases the strength and durability of the roofing system. This results in a membrane that resists splitting and rupturing, adding to the life expectancy of the roof.