Ponytail Hairstyles simply by linking hair clips with ponytails prefabricated. These extensions can range from a few dollars to several hundred depending on whether they are real human hair, horse hair, or synthetic. These types of extensions are still wildly popular in 2011. Jessica Simpson line, for example, observed on both popular and relatively cheap compared with some of the hair extension lines. These ponytails come in a large and diverse, with wavy, curly extensions, or perfectly straight being the most popular in the habit.