The Extreme Length Sealer is the hair care for longer, stronger hair: The leave-in treatment is a care with biotin and soy proteins that strengthens damaged hair and helps the hair to grow longer and stronger. The intensely nourishing hair cream counteracts hair breakage, strengthens weakened hair, and provides a healthy appearance and beautiful shine. Unwanted hair breakage is reduced when the complete product line of Redken Extreme Length is used (shampoo, conditioner, and leave-in treatment). The leave-in hair mask helps reduce the appearance of split ends. It also gives the hair smoothness and shine without weighing it down, providing a natural hair feel and easy styling.