Gain volume and patch up thinning areas with one of the best hair thickening products out there for gray hair. Toppik Hair Building Fibers is made with advanced technology for matching hair’s natural look and feel, and colorfast technology for weather and perspiration-resistant color that won’t fade or stain. Whether covering traces of hair extensions, filling in the lines around your part, or touching up roots, this product is perfect for you. Natural keratin protein fibers like the ones in your natural hair make up this formula, for a look and feel that is entirely undetectable. Utilizing static charge to cling to your hair, the Hair Building Fibers enhance hair of all types and textures. For a product that washes cleanly out of your hair, yet leaves the same vibrant color and thickness, Toppik is ahead of the game. The Hair Building Fibers are sweat-resistant, rain-resistant, and wind resistant. Never fear stains on bedding or clothes, the colorfast technology does not bleed and blends in with your natural color beautifully.