booster pad

plural booster pads

1. A diaper insert, especially a large one in the shape of a pad that is typically used overnight or for adult incontinence.

   Both disposable and reusable small insert pads are available without a waterproof backing for use as a booster pad or with a plastic-backed garment.

   1993, Nursing Times, volume 89, numbers 1–13, Macmillan Publishers, page 62

   2 more examples

   I'm using a proper Kooshies cotton booster pad at night or when she's drinking a lot, plus a flushable liner when I expect something pretty gross to occur shortly.

   1998 May 21, KarCun, “Kooshies - tips needed”, in misc.kids (Usenet)

   "Those kinds of products have a waterproof backing. So when you put a male guard into a diaper, the, um, liquid can't flow into the padding of the diaper. Instead it just spills over the sides." This made sense. Dolly recommended a booster pad, which had no such backing, and therefore would provide the added absorbency I was seeking.

   2014, Susan Allen Toth, No Saints Around Here: A Caregiver's Days, University of Minnesota Press, →ISBN, unnumbered page