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BosVolumize Hair Thickening Fibers - Dark Brown naturally bond to existing hair with keratin fibers that blend and cover thinning and low-density areas. Bosley Hair Thickening Fibers are a safe and effective way to eliminate the appearance of baldness and thinning hair. It is perfect for both men and women with hair loss as well as recent hair transplant patients. BosVolumize Hair Thickening Fibers provide instant thicker fuller-looking hair. BosVolumize Hair Thickening Fibers naturally bond to existing hair with keratin fibers that blend and cover thinning and low-density areas. Because our own hair is made of Keratin and naturally holds a positive charge, BosleyMD Hair Thickening Fibers are designed to mimic our own human hair but with a negative charge. Therefore, when negatively-charged, lightweight, easily blended BosleyMD Fibers come in contact with our positively-charged hair, it creates a static-cling effect, naturally binding to the hair shaft creating instantly thicker, fuller-looking hair. Blend and cover thinning and low-density areas with Keratin Hair Fibers that naturally bond to existing hair for instantly thicker, fuller-looking hair. Also great as a root touch up between color service. Creates instant thicker fuller-looking dark brown hair Electrostatically attaches to existing hair follicles Covers-up fine and thinning areas of hair Perfect for temporary cover-up post-procedure Enhances existing procedure density Easy application Cruelty-free, sulfate-free, paraben-free, color safe