TRESemme Keratin Smooth Shampoo + Conditioner is formulated with Argan Oil and Keratin Protein that gives 72 hours of frizz control and professional-quality smoothness for straighter hair with natural movement. Keratin proteins are the natural building blocks of hair and work by smoothing down the hair cells, leaving the strands stronger, smoother and easier to manage. Enriched with marula oil, this fast-absorbing and ultra-lightweight oil seals the hair follicles for ultimate softness and shine. These professionally formulated products combines five smoothing benefits in one: fights frizz, detangles knots, boosts shine, adds softness and tames fly-aways.