GENESIS SF - GENESIS SF Synthetic Macro Fibers are manufactured and engineered for secondary reinforcement of concrete for primary use in Pre-cast and slab on Ground applications. The design of the GENESIS SF is consistent with other GENESIS fibers, providing excellent plastic shrinkage crack reduction, while enabling the cementitious material to develop its optimum integrity and improve its long-term durability. Its enhanced properties impart toughness, impact and fatigue resistance.