I will answer that question. Everyone needs Strength; Lather Salon Aspen’s unique signature Protein infusion. If you have anything but virgin hair, for instance if you color, blow dry or flat iron your hair you need to replenish the hair cuticles’ luster and shine. Strength works by, in layman’s terms, filling the potholes in the strands of hair. You use it every time that you shampoo and condition your hair. After rinsing out your shampoo, apply a few pumps of the foam into your hands working all throughout your hair; apply your conditioner directly on top of the treatment and let sit for 3-5 minutes. It may take a few applications before you notice a difference. Strength works over time repairing and protecting your hair leaving it more manageable and filled with its natural body.