Toppik’s Xfusion Keratin Hair Fibers White instantly creates the look of thicker, fuller hair. Composed of natural keratin, these microscopic fibers adhere to existing hair, effectively concealing thinning spots and hair loss.This resilient product withstands wind, rain, and perspiration, remaining intact until shampooed away. It’s ideal for adding a natural-looking thickness to hairstyles, perfect for covering part lines, touching up roots, and hiding fine or thinning areas.