American Crew Classic Boost Cream. Take hair to new heights with American Crew Boost Cream. Formulated to enhance natural definition and separation for healthy volume and shine. Guaranteed to make you look and feel great, the American Crew Boost Cream brings a modern styling approach to classic grooming. Using glycerin and mineral oil to soften your style and add volume, this professional formula also features triethanolamine to prevent dryness while thickening agents provide added body and fullness.