The Too Faced Lady Bold Waterproof Lip Liner is a lip pencil from the brand's cosmetics collection, described by Too Faced as waterproof. It comes in a 0.23g size.
Lip liners are usually applied before lipstick: trace the natural outline of the lips first, then fill in lightly if you want a base that helps your lip colour sit evenly. For softer definition, blend the line slightly with a fingertip or lip brush.