Function MousseFrae and Co. Function Mousse is the ultimate styling essential. This lightweight, sulfate free, alcohol free, and paraben free formula adds volume, eliminates frizz, and enhances shine while providing heat protection for all hair types. Designed with a vegan formula thats safe for extensions, it delivers weightless hold and touchable softness without buildup. Elevate your styling routine with Function Moussebecause your hair deserves the best.