WHAT IT IS Toppik Hair Building Fibers_ made of colored keratin protein_ blend undetectably with existing hair strands to instantly create the appearance of naturally thick_ full hair. WHAT IT DOES Instantly fills in thinning areas Conceals hair loss Makes fine hair look completely thick and full Great as a root touch-up between colorings WHAT ELSE YOU NEED TO KNOW Toppik Hair Fibers resist wind_ rain_ and perspiration for long-lasting results in all conditions. Available in nine shades that can be mixed to match virtually any hair color_ Hair 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.