L'Oréal Elnett Hairspray, $14.99 for 11 ounces
Hairstylists talk about this hairspray like chefs talk about a razor-edged Japanese knife: It delivers beautiful results, consistently, and it's an indispensable tool in their arsenal. A fine mist of Elnett gives incredible hold (even for the most vertiginous updos) and brushes out easily, so it doesn't leave hair fuzzy or dull. Before it became available in the U.S. four years ago, pros smuggled Elnett home from Europe in their suitcases. Now you can find it at almost any American drugstore.