Biolage Smooth Proof Serum – 3.4oz is a frizz-controlling, humidity-resistant finishing serum designed to smooth and polish unruly hair. Infused with camellia extract, this lightweight formula tames flyaways, adds shine, and protects against environmental aggressors. Perfect for all hair types, especially frizz-prone or coarse textures, it leaves hair sleek, soft, and manageable with a long-lasting, salon-smooth finish. Use on damp or dry hair for instant shine and control.