The 4th step of the advanced REVOX B77 PLEX Hair Rebuilding System. This professional-level shampoo is formulated to deeply hydrate and repair frizzy, damaged, or color-treated hair and maintain an optimal hydro balance. It gently removes dirt & oil build-ups from hair and scalp, promoting their stronger, healthier appearance. It helps reduce flyaways and detangled ends. The hair gets shinier, smoother, and more easily manageable with every use.