Made of colored keratin protein, blend undetectable with existing hair strands to instantly create the appearance of naturally thick, full hair. Instantly fills in thinning areas, conceals hair loss, resist wind, rain, and perspiration for long-lasting results in all conditions. Available in two shades that can perfectly match your hair color, Keratin 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.