Powered by Living Proof's patented Healthy Hair Molecule (OFPMA) and Thickening Molecule (PBAE), 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. It delivers five benefits for beautiful, healthy-looking hair in one easy step: smoothness, volume, conditioning, strength, and polish. It styles and treats without compromising one for the other. This treatment is safe and formulated for color and chemically treated hair, making it ideal for all hair types. Perfect Hair Day (PhD) 5-in-1 Styling Treatment is silicone-free. It also offers heat protection for up to 230°C, minimizing the risk of styling damage.