Booster pads are like a diaper within a diaper. Some of them, like the ones by tranquility, absorb and fill up with liquid until they are full, then transfer any additional liquid to the incontinence brief, pullup, underwear, or belted undergarment that is outside of it. They are not meant to be worn by themselves for incontinence protection. They simply add to aborbancy and protection, making the incontinence product that you are wearing that much more helpful. Booster pads can be worn overnight or during the day, and are often a good way to add that extra level of safekeeping.