All our products and its functionalities are clinically proven. Features: Real smudge-proof means no smearing on the actual eyelid area. Morning till dawn- perfect consistency that cannot be imitated with clinically proven quick-dry and instant-adherence functions. Made of 100% nylon, the amount of eyeliner liquid absorption is decreased but the discharge rate is increased. Soft elasticity that dost not allow irritation to sensitive eye area. One Liner, Two Effects: Thick: Vivid towards the beginning of your eyelid & Thin: Sharp for your wing. Easily and quickly, complete an attractive eye-line with a dual liner for the eye look that you desire. Life-proof dual shot liner that will make your liner routine much easier. Nylon material that replaced for the shortcomings of regular brushes and polyester material. N-Proof/Long Lasting: N-Proof (waterproof, smudge proof, sweat proof, oil proof), enhances durability and consistency all day. 24-hour of perfect consistency with fast adherence feature onto the skin as soon as you put on the liner. A new challenge to life-proof liners. Clear and sharp eyes for the whole day.