The Bumwear Micro-fiber Insert are made from 3 layers of micro-fiber terry cloth. They are super soft and more importantly, super-absorbent and comfy for the baby with no snaps or any bumps to sit on. These inserts do away with the bulk that may have been traditionally associated with cloth diapers and they make the Bumwear diapers very trim and absorbent at the same time. We normally recommend purchasing 2 or 3 inserts per diaper or training pant that you buy. This is because it takes longer to dry than the diapers and also, some moms use 2 diapers at the same time for their heavy wetting babies.