To help keep your hair straight all day you should wrap your hair dry the night before. All you have to do is take a fine toothed comb, and comb your hair around your head like a bee hive. After your hair is wrapped, you should use a firm bristled brush to make your wrap tight and flat. After it's tight you should tie your hair down with a scarf. The next day comb your wrap loose, and your hair should stay straight for most of the day.