21" Clip In Hair Extension by Christie Brinkley creates long luscious length in an instant. This lightweight, one piece hair extension uses three hair clips for a seamless application that blends in effortlessly while delivering ample volume. These hair extensions are made using heat friendly synthetic hair that can be styled with temperature controlled heat tools at 150° C. Create glamorous looks in an instant with the 21" clip in hair extension from Christie Brinkley.