It's summertime and my girls are blonde and their hair gets lighter from being in the sun. Since they are also avid swimmers, the pool water does horrible things to their beautiful hair. It becomes brassy, dull, and hard to brush, to say the least. We used Malibu C ALL of last summer and it worked wonders! It kept the shine and also kept their beautiful blonde locks from turning green! We LOVE Malibu C!!!