Biolage Full Rescue Densifying Leave-In – 8.5oz is a lightweight, leave-in treatment designed to strengthen and visibly densify fragile, thinning hair. Formulated with vegan squalane and biotin, it helps reinforce the hair fiber, reduce breakage, and improve the look of fullness over time. This non-greasy formula adds softness and manageability while creating the foundation for thicker, healthier-looking hair. Ideal for daily use and safe for color-treated hair.