Apply a Coat of Armor
Product is key to preventing frizz, says Rita Hazan Stylist Cristina B. "I would start with a leave-in conditioner that controls frizz, like Red E To Go ($24.95, folica.com). Then use a smoothing cream on top, like Oribe Supershine Moisturizing Cream ($49, oribe.com)." Both create an outer shield to prevent strands from expanding when exposed to extra moisture. Humidity is, of course, extra moisture held in the air. The more hydrated the hair before exposure, the less susceptible it is to frizz. Then style the hair up or down as you normally would.