Add strength and shine to locks with the Living Proof Perfect Hair Day (PhD) 5-in-1 Styling Treatment. In just one easy step, the formula works to smooth, volumise, condition, strengthen and polish tresses, using the brand’s patented Healthy Hair Molecule and Thickening Molecule.The nourishing treatment delivers nutrients and hydration to hair, taming frizz and preventing breakage for a softer, more supple hair fibre. Delivering heat protection up to 230°C, the colour-safe formula will leave locks full of bounce, shine and visible health.Safe for coloured and chemically-treated hair.