The L'Oréal Paris Unbelieva'Brow Longwear Topcoat is designed to fix and define eyebrows, offering up to 30 hours of hold. This transparent, waterproof, and smudge-proof topcoat can be used with any eyebrow product. Its ultra-precise mascara brush allows for precise application, shaping individual hairs. The formula dries quickly, remains flexible for a natural look, and prevents clumping or smudging of existing eyebrow makeup.