You are going to find Toppik Dark Brown Hair Building Fibers a useful product if your hair are losing their natural thickness and volume. The Dark Brown Hair Building Fibers ideally match with the naturally dark brown hair having mild red undertones. They cover up thinning hair areas, bald spots and re-growing roots of dyed hair too. Once these micro-fibers blend well into the hair they remain invisible to the eyes. The hair are left looking full yet natural.