Living Proof Perfect hair Day (PhD) Conditioner is a revolutionary weightless conditioner that helps deliver beautiful healthy looking hair by improving its appearance over time. It's powered by our patented Healthy Hair Molecule, which in this formula does four things smooths hair, polishes and protects strands, creates visibly healthier hair over time and helps repel dirt and oil to keep hair cleaner, longer. Your hair will look beautiful and healthy while staying cleaner longer. It is sulfate-free and silicone-free. Safe and formulated for color and chemically treated hair.