Toth recommends swapping your usual hydrating products for an oil when it's super hot and humid outside. "Oils can smooth your hair without breaking down from moisture caused by sweat or humidity." He recommends the Essence Absolute by Shu Uemura ($69). "It nourishes the hair, rebalances moisture and even comes in travel size which is perfect for the beach or for on-the-go throughout a humid day," he said.