Dark Brown Hair Thickening Fibers for Lasting Fullness. KEY FEATURES & BENEFITS: ‣ Dark brown fibers blend seamlessly with natural hair color. ‣ Creates a fuller look by covering sparse areas instantly. ‣ Stays in place through wind, rain, and sweat. ‣ Enhances hair volume without causing scalp irritation. ‣ Ideal for anyone seeking thicker, more voluminous hair.