Additional booster sets to be used in conjunction with the Tickle Tots Two Nappies. Each booster set comes with one larger booster and one smaller booster. Use the smaller booster alone for newborns, then move on to the larger booster and finally use both together overnight or for heavy wetters. Both boosters have a bamboo fleece core with a suede cloth top, keeping little oneâ€™s skin dry. Each booster has a bamboo fleece core with a stay-dry fabric top, wicking all the moisture to the absorbent core and keeping your little one's skin dry.Â Each booster has handy snaps to secure it into the shell to avoid sliding. The larger booster also features a waterproof back to protect the shell (to get maximum use from the shell).