Sebastian Repair Strengthening 33.8 oz Penetraitt System strengthens stressed hair against damage due to chemical treatments, heat damage and environmental elements. This system helps reduce breakage and removes impurities leaving hair clean, soft and bouncy. It is color safe! Sebastian Penetraitt 33.8 oz protects and strengthens stressed hair against damage when it is wet and most vulnerable. This system provides effortless detangling and deep conditioning, transforming hair from dry and dull to soft and shiny. Recommended for chemically treated hair.