The Biolage Smooth Proof system is your ticket to polished, shapely hairstyles. As the first step, reach for Biolage Smooth Proof Shampoo, meant for those with wavy, curly, or frizzy hair. This paraben-free shampoo, which takes inspo from nature's water-resistant camellia, provides humidity control and anti-frizz smoothness by encapsulating hair in a protective shield. The result: more manageable, easier-to-style strands. Safe for color-treated hair.