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. The gauze is softer and faster absorbing and the birdseye while still soft is not as soft as gauze but has slightly greater absorbency. Sold in 4 packs. Expect 10-15% shrinkage in length and 5-10% in width.