Nothing is murder on hair like summer's heat and humidity. Whether you have straight, shiny locks or coarse 'n curly tendrils, warm air interferes with sleek, polished styling.
A possible fix? Sideswept, one-shoulder waves.
It's an intentionally messy style -- in fact, the messier, the better. You can get away with not washing your hair, using little product and avoid further sweating from the blowdryer and flat iron.