This 23" Wavy Clip-In Hair Extension kit from hairdo™ Jessica Simpson and Ken Paves allows you to add stunning long wavy length to short and mid-length hair. If you already have long hair, you can use this kit to add volume and texture to your existing hair. This HairDo Extension kit is made from 100% Kanekalon Vibralite modacrylic fiber, the finest quality synthetic fiber available. Affordable, lightweight and easy to attach, these virtually undetectable extensions can be put in and taken out in a matter of minutes. All HairDo Clip-in Extension Systems consist of one multi-level, contoured piece that creates an easy, fashionable style without the hassle of working with several individual wefts. hairdo Vibralite modacrylinc fiber clip-in extensions are available in sixteen multi-tonal shades that have been created to blend with just about anyone"s hair color.