Doublers can be used to boost the absorbency of your pocket inserts, fitted nappies or prefolds. These hemp doublers from Swaddlebees are made of 4 layers of organic cotton/hemp fleece sewn together in pairs. They fit perfectly in between the layers of a Swaddlebees hemp insert, or underneath the quick-dry soakers of a Swaddlebees or other fitted nappy, however these doublers are not wide and long enough to be used alone as inserts in pocket nappies.