How do panty liners work?

Panty liners are placed in the crotch of your panties and secured to the fabric with adhesive (sticky stuff). Panty liners usually have three layers: a top layer, a thin absorbent layer, and a back layer. The top layer allows moisture to be pulled into the absorbent layer away from your skin. The back layer helps keep moisture inside the panty liners, away from your underwear.