Ustar keratin fibers, made of colored keratin protein, blend undetectably with existing hair strands to instantly create the appearance of naturally thick, full hair. Ustar fibers resist wind, rain, and perspiration for long-lasting results in all conditions. Available in nine shades that can be mixed to match any hair color. Ustar fibers work for all hair types and textures. Also great for part lines, covering extension tracks and touching up roots between hair color appointments. Easily washes out with shampoo.