One of the main keys to prolonging the lifespan of the beautiful look of your treated hair is to keep the shaft from drying. Many treatments damage the hair, allowing a drying process to be accelerated. A good moisturising barrier will prolong the look and health of the hair. The best moisture for hair is actually water. To function properly, the body requires between one and seven litres of water per day to avoid dehydration. Water is good internally and externally for hair. Internally a well-hydrated body means that there is sufficient moisture for hair function, externally it means that the hair can maintain elasticity and suppleness.However, hair is porous and keeping this moisture in hair is next to impossible without sealing it in.. Directions for use: Only a small application is required for an exceptional wash. Wet hair, apply shampoo, rinse. Repeat.