OUAI Thick Shampoo in Beauty: NA. OUAI Thick Shampoo in Beauty: NA. Multiple hair concerns? We've got the solution. OUAI's Thick Shampoo was formulated for thick hair to strengthen & calm with Keratin and detangle with smoothing Marshmallow Root. Shea Butter delivers deep hydration and acts as a sealant to lock-in moisture, while Avocado Oil prevents breakage and fights frizz from the start. So cancel that blowout appointment, you won't need it.. Ideal for dry, thick hair. Cruelty-free. Free of Formaldehydes, Formaldehyde Releasing Agents, Phthalates, Mineral Oil, Retinyl Palmitate, Oxybenzone, Coal Tar, Hydroquinone, SLS, SLES, Triclocarban and Triclosan. 10 fl oz/ 300 ml. Thoroughly wet hair from roots to ends with lukewarm water. Lather a quarter size amount of shampoo in hands and work into roots and anywhere hair touches the scalp, then rinse. Rinse with cold water to close the hair cuticle and add shine. OUAR-WU91. FG-0128-A-00. Founded by hair stylist to the stars Jen Atkin, OUAI - pronounced way - originated HAIRGOALS. The mane addicts at OUAI believe that life is hard and looking good should be easy. That's why their line of luxury shampoos, conditioners, and styling products was designed to nourish hair and bring out its natural beauty - no glam squad necessary.