Available in your choice of birdseye or gauze fabrics (100% cotton).  Used inside any cloth diaper, these put added absorbency where it is needed most without a lot of extra bulk.  The birdseye inserts are 4 layers and the gauze are 6 layers.  Because gauze is a little thinner both types of our inserts are about the same thickness.  Sold in 4 packs.  Expect 10-15% shrinkage in length and 5-10% in width.