Between conditioner and shampoo, conditioner might come with the most emotional baggage. It’s the first step in styling, it’s responsible for helping repair hair damage from color and styling, and, for women with fine hair, they’ll often skip it entirely out of fear it will weigh down their potential volume. But the right conditioner can solve a lot of problems: define curls, smooth frizz, seal split ends, and, for those who want volume, actually fill strands to make them thicker. It’s just a matter of finding the right one. Here, Coveteur editors—who test enough conditioners to be know-it-alls (see below)—share their top picks.