Toppik Hair Building Fibers are made from keratin protein, the same protein that makes up human hair. These microscopic, electrostatically charged fibers adhere to existing hair to instantly conceal the appearance of thinning hair. Utilizing these fibers provides a natural-looking improvement in hair density and volume, effectively concealing areas where hair is sparse. They are simple to apply and resistant to wind and light rain, offering a reliable cosmetic solution for thinning hair concerns.