Toppik Hair Building Fibers in Dark Brown is a revolutionary hair thickening solution that provides instant fullness for thinning hair. This 27.5g container features natural keratin protein fibers that bond seamlessly with existing hair to create the appearance of thicker, fuller hair instantly. Key features: • Made with natural keratin protein fibers • Instantly creates fuller, thicker-looking hair • Stays secure until next shampoo • Weather and wind resistant • Color-matched for dark brown hair • Easy to apply and remove • Safe for daily use The dark brown fibers work through static electricity to bond securely with existing hair strands, creating natural-looking density and coverage. The product is ideal for both men and women looking to conceal thinning areas or add overall volume. The fibers resist wind, rain and perspiration but wash out easily with regular shampoo. For best results, the product can be used in conjunction with Toppik's fiber hold spray for enhanced durability.