Add length and volume to your hair instantly with Toppik Hair Building Fibers. With high-quality keratin, it intertwines and blends with your existing hair to make it look thicker and fuller, as well as hide thinning spots effectively. The hair building fiber is resistant to wind, rain and sweat to provide you with long-lasting coverage. It washes off easily with shampoo. Adds volume and length to your hair instantlyIntertwines and blends with your existing hair strandsResists wind, rain and sweat for long-lasting coverageWashes off with shampoo easily