Summer is (very) slowly, but surely making its way here and that means vacations, lots of SPF, ultimate relaxation and … hot, gross, sticky weather. But surprise: Humidity is actually your friend when it comes to enhancing and unleashing tousled, undone waves, which happen to be the style for summer, according to L’Oréal Professionnel Ambassador and Celebrity Stylist Anh Co Tran. (And he’s the expert, considering that his beach hair technique is so legit he trademarked it — Lived-In Hair™ and his celebrity client list includes tousled wave queens like Demi Lovato, Lily Collins, Ashley Madekwe, Rashida Jones and Chloe Grace Moretz.)