Living Proof Perfect hair Day (PhD) 5-in-1 Styling Treatment is a genius solution that allows you to style and treat in one step. Powered by Living Proof's patented Healthy Hair Molecule (OFPMA) and their Thickening Molecule (PBAE), Perfect hair Day (PhD) 5-in-1 Styling Treatment: Delivers the five benefits for beautiful healthy looking hair in one easy step - smoothness, volume, conditioning, strength and polish Styles and treats without compromising one for the other Perfect hair Day works hard to keep hair looking and feeling healthy. The Perfect hair Day line*: Delivers the five benefits for beautiful, healthy looking hair - smoothness, volume, conditioning, strength and polish Helps you wash your hair less often Makes hair look healthier instantly and gets better over time