From the manufacturer:

For an ultra defined line and 15-hour staying power.

With this unstoppable liquid eyeliner, the smudge-free look you see in the morning is the look you keep all day.

Superfine felt tip applicator gives you a precision line every time.

Waterproof formula glides on, stays on, won't budge.

Removes easily with Gentle Eye Makeup Remover or any oil-based eye makeup remover.