Infusium PRO 23 Original Leave In Treatment infuses hair with a Pro-Vitamin B5 formula to deeply penetrate and repair the cuticle layers from damage. Detangles and strengthens, while helping protect against breakage. Lightweight formula won't weigh hair down--can be used daily. Can also be used immediately following chemical processingto help seal the cuticle, leaving hair healthy-looking with superb manageability and shine. 33.8 Ounces.