The other key feature of this eyeliner is in its staying power. Brand Creator Sara Au Yeong tested the eyeliner in every possible condition where it might smudge: the shower, massages, workouts, and on her trips to Asia in over 40 degree Celsius weather. It stays on beautifully every time. Some of our clients even took it on camping trips where this product earned its nickname "The 24-hour Eyeliner." At Amaterasu, we believe purity is just as important as performance so we have continued to perfect this formula; even the most sensitive individuals can wear it. As with all Amaterasu makeup, this Liquid Eyeliner is paraben-free and phthalate-free. The clean ingredients and unique formulation ensures that you can use these products with peace of mind. Waterproof Smudge-proof Micro-fiber Tip Brush 24 hour formula Paraben Free Phthalate Free PFAS Free