A panty liner is a product designed to give you a way to feel cleaner, fresher and drier any time of the month and any time of the day or night. A panty liner is thinner and generally smaller in size than a full size feminine napkin (pad). Panty liners are great to wear as backup protection when you have your period and are using a tampon. They are also great for absorbing wetness and protecting your panties from normal discharge, perspiration and unexpected menstrual flow.