This Jessica Simpson Hair 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 Jessica Simpson 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.