Eyeko Eye Do Liquid Eyeliner is a waterproof, carbon black liner with Widelash lash enhancer. "The nib is the perfect shape and size to give you control. It gives you the precision to draw on the perfect cat eye. It's pitch black and waterproof so it doesn't move even on the waterline. I love that it enhances my lashes each time I use it." -Alexa Chung
"An eye-liner pen - guaranteed to last longer than a pencil, even over shadow - which actively thickens the lashes after 15 days of use." -Vogue