A waterproof eyebrow pencil for long-lasting and full, defined brows. What Else You Need to Know: This Dior makeup essential features an ultrafine retractable tip for effortless precision and blending. The waterproof formula gives brows a naturally full and well-defined appearance for flawless eye makeup looks that last. Clinical Results: In an instrumental test on 26 subjects, results showed:- The Diorshow Brow Styler Eyebrow Pencil created full, defined brows for 24 hours