Mane Founder Jen Atkin, Hailey Bieber's Go-To Stylist, Swears By These Beauty Finds

OUAI Super Dry Invisible Dry Shampoo ($30)

Dry shampoo isn't just for greasy roots, according to Atkin. She uses it as a preventative step to extend styles and protect against sweat or humidity. "I always use dry shampoo no matter what, even if your hair is not greasy or oily," she explains. "It always just helps to make sure if you're dancing or if you're gonna go to a workout, your hair is gonna stay clean...it kind of gets ahead of the problem."