What it is: A weekly leave-in, repair treatment clinically proven to rebuild the structure of hair. This patent-pending technology makes hair 8x stronger*, smoother and shinier after one use. Leave this 450 heat protectant on for 10 minutes before adding your styler and heat for best results. Hair Type: Fine, Medium, and Thick Hair Texture: Straight, Wavy, Curly, and Coily Hair Concerns:- Damage/Split Ends/Breakage- Heat Protection- Shine Key Benefits: - Clinically Proven to Reconstruct Hair- Repairs and Protects Against Damage- Stylists Prefer Over Leading Bond-Builder Highlighted Ingredients:- 3-D Fortifying Technology: Patent-pending tech forms a 3-D network to help rebuild and resist damage.- Encapsulated Cellular Oil: Helps defend hair against thermal and UV damage and color fading.- Biomimetic Emollient Blend: Smooths and aligns hair fibers, resulting in softness and shine. Ingredient Callouts: Free of parabens, formaldehydes, formaldehyde-releasing agents, phthalates, mineral oil, retinyl palmitate, oxybenzone, coal tar, hydroquinone, sulfates SLS & SLES, triclocarban, triclosan, and contains less than one percent synthetic fragrance. It is also cruelty-free and comes in recyclable packaging. What Else You Need to Know: This leave-in formula is good for all hair types and levels of damage. This leave-in formula is clinically shown to rebuild the structure of your hair via a patent-pending technology to prevent breakage, reduce visible signs of split ends, and offer heat protection up to 450°F/232°C. Clean at Sephora is our commitment to offering effective products without certain ingredients, such as parabens, sulfates, phthalates, and mineral oils. Learn more here.