bumGenius microfiber inserts are designed to absorb enough pee to keep baby’s bottom dry. They suck moisture in and hold onto it. Did you know our second quality microfiber inserts and diaper doublers can be purchased for a great price? Because these inserts have minor flaws or cosmetic issues, we sell them at a deep discount. Stock up and get to using them! Microfiber can be used for much more than diapers! Besides diapers, there are tons of tasks that microfiber inserts can tackle. Here are some ways customers have told us they use their microfiber inserts. Cleaning cloth. Microfiber