Hair Building Fibers Powder For Men. Conceal hair thinning and bald spots in a couple of shakes with men’s hair building fibers by Absolute. Natural-looking microfibers are strong enough to resist water, sweat and wind, and easily washes out with regular shampoo. To apply, simply shake fibers over bald or thinning areas until you achieve the coverage you want, and seal in powder with fiber-locking spray (sold separately). Hair building fibers are a hassle-free way to regain a lifelike fullness. You can use the larger bottle (0.81 oz.) for daily use and the smaller bottle (0.35 oz.) as a travel-size option. Suitable for all hair types. Available in Black and Dark Brown. Must be used with hair fiber spray, sold separately.