OUAI Fine Hair Shampoo - Biotin Thickening Shampoo for Flat, Thin Hair - Volumizing & Strengthening Keratin & Chia Seed Oil for Women & Men - Lightweight, Color-Safe, Sulfate Free, 10 OzTurn The Volume All The OUAI Up: Is volume just a button on your phone? This thickening shampoo delivers major bounce and lasting volume with a gentle clean that doesn't strip. So you can finally be fine with being fine. Stronger Strands, Less Breakage: Biotin reduces breakage, hydrolyzed keratin smooths and adds shine, and chia seed oil thickens and volumizes without weighing hair down. Apply to roots and work through to ends. A Clean Formula You Can