One of the features with this is that it's waterproof.
From Amazon
Sleek MakeUP Sleek MakeUP Kohl Liner, High Impact Easily Blendable Eyeliner, Part Time Lover 1.2g
The Beauty Store
Sleek MakeUP Lifeproof 12 Hour Wear Eyeliner Pencil Part Time Lover
This product is also available at 2 unverified merchants.