“Less is more” is the guiding principle of Purely Perfect, a minimalist approach to haircare created by Michael Gordon. The founder and former president of Bumble and Bumble seeks to do away with the unnecessary—vitality-stripping sulfates and detergents as well as your shelf of shampoos, mousses, sprays, and masks—in favor of a universal, two-in-one cleanser/conditioner and a pair of styling products that can do the work of a dozen conventional products.