Simply Wavy Pony by Hairdo is one of the sexiest looks this season with it's natural, tousled waves... just this side of messy. As easy as it is breezy, style the Hairdo Simply Wavy Pony with fingers - not with a comb. This 18" ponytail hair extension has a soft wavy texture and a discreet wrap-around piece that finishes the style with a perfectly polished look.