The Toppik Hair Building Fibers are an ideal solution to cover up thinning hair. The fibers are made from natural keratin protein, which is identical to human hair and can be applied quickly and easily with a spray applicator. The fibers blend seamlessly into existing hair strands, creating a fuller look that lasts all day long. With Toppik Hair Building Fibers you can instantly create the illusion of thicker, healthier-looking locks in minutes! These keratin-derived fibers are safe, and blend undetectably with your existing hair to create the appearance of natural look. Derived from a natural wool source Fibers are resistant to rain and wind Smooth texture and gives protein to the hair