X Fusion Keratin Hair Fibers are a cosmetic breakthrough that immediately gives men and women thicker-looking hair. It consists of colored organic fibers made of pure keratin protein – the same protein that makes up human hair. When shaken onto balding or thinning hair, XFusion fibers instantly and securely fill out the hair a person already has, giving him or her the appearance of having significantly more hair. Since XFusion works with existing hair, it can enhance even the sparsest areas. It is not, however, appropriate for completely bald individuals.