The waterproof formula is long-lasting and smudge-proof.The Precise Lash Building Brush allows you to get the result you want, allowing the lashes to go from everyday to dramatic in just a few strokes for clean separate finish without the clumps.Conditions as it thickens.Waterproof. Why you'll love it.Formula glides on smoothly to build great-looking lashes.Lash building formula makes lashes look fuller. No clumps.Ophthalmologically tested.Suitable for contact lens wearers.