Diaper Doublers are used along with your diaper's insert to boost (or "double") the absorbency for heavy wetters and night-time diapering. Doublers are an essential part of any cloth-diapering stash! We recommend having about 2-3 diaper doublers on-hand (depending on how often you wish to do laundry, and assuming you're really only using a doubler for night-time diapering).