Purpose Volume cream that will give hair a natural, healthy shine while defying gravity. American Crew Classic Boost Cream enhances your hair’s natural definition and separation while freeing you to use a variety of other American Crew products alongside. Method Apply a generous amount of American Crew Classic Boost Cream to your hands and work evenly throughout towel-dried hair. It contains natural mineral oils to soften hair and increase its volume. The Boost Cream also prevents dryness while ensuring your hair remains full-bodied and strong.