N.Y.C. hairstylist Dana Gibbs, who has worked with Rihanna, uses this power pair on clients "who want big, sex-kitten hair." Unlike some other volumizing shampoos and conditioners that superficially coat locks, these nonsticky formulas contain polymers that help strengthen fine, fragile strands. "I especially love it for blondes," says Beverly Hills hair pro Jennifer J. "It has incredible shine that makes their hair look more vibrant.