-Part of a 3-step restructuring system for damaged hair. -Deeply penetrates to hair shaft to work from inside. -Heals hair weakened by chemical processes heat styling & external exposure. -Fortified with quinoa protein to help strengthen hair. -Helps hair restore health silkiness & shine. -Apply weekly on cleansed hair from roots to ends & leave on for 2-5 minutes. Then rinse off. Product Line: Aveda - Hair Care. Product Size: 150ml/5oz