You don't need us to tell you that a ponytail feels lighter than a heavy, down do. But we can tell you why. Keeping your neck cool helps regulate your body's overall temperature. So slick up your hair like Joy Bryant. The key to getting this smooth style? While hair is wet, pull it supertight, and use more hairspray than you think you need, says stylist Amoy Pitters, who created Bryant's look.