XFusion Hair Building Fibers are all natural Keratin “hairs” that bind to your own existing hair to instantly make your hair look fuller and thicker. XFusion won’t come off in wind, rain or perspiration. It is totally undetectable, even from as close as two inches. XFusion stays securely in place giving natural looking thickness and fullness until the next time you shampoo. It is compatible with all hair products and is great for both men and women. No matter what your condition, if you feel concerned about visible hair loss, XFusion will change the way you feel about yourself every time you look in the mirror.