Revlon ColorStay Brow Fibre Filler™ in Dark Brown is a brow product that contains tiny fibres that adhere to your brows to help fill in sparse areas and create a fuller look. The product is designed to be long-wearing and waterproof, helping to keep your brows looking great all day. The formula is also infused with conditioning ingredients to help nourish your brow hairs. The product comes with a spoolie brush applicator that allows you to easily distribute the fibres throughout your brows.